# Do You Know How To Use Air Break?

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In the quiz below we, look and want to ascertain that you know how to use the air breaks. Despite of the answers you are going to give and the results, it is certain that you are going to learn.

• 1.

### Hydraulic systems use brake?

• A.

A. Steam

• B.

B. Compressed air

• C.

C. Water

• D.

D. Brake fluid

D. D. Brake fluid
Explanation
Hydraulic systems use brake fluid because it has the necessary properties to function effectively in the system. Brake fluid is a type of hydraulic fluid that is specifically designed to withstand high temperatures and pressures. It has a high boiling point, low compressibility, and excellent lubrication properties. These characteristics make it ideal for transmitting force and energy within the hydraulic system, allowing the brakes to operate efficiently and effectively.

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• 2.

### Brakes convert the energy of a moving vehicle into?

• A.

Water

• B.

Compressed air

• C.

Heat

• D.

Noise

C. Heat
Explanation
When a vehicle is in motion, it possesses kinetic energy. Brakes are designed to convert this kinetic energy into heat energy through friction. As the brakes are applied, the brake pads press against the rotors, creating resistance and converting the vehicle's energy into heat. This heat is then dissipated into the surrounding air. Therefore, the correct answer is heat.

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• 3.

### Air compressors are powered directly by the engine or by using?

• A.

Belts and pulleys

• B.

Brackets and supports

• C.

Chains and sprockets

• D.

Belts and Chains

A. Belts and pulleys
Explanation
Air compressors are powered by belts and pulleys. Belts and pulleys are commonly used to transfer power from the engine to the air compressor. The engine drives the belt, which in turn rotates the pulley attached to the air compressor. This rotational motion of the pulley is converted into compressed air by the air compressor. Belts and pulleys provide a reliable and efficient method of transferring power, making them a popular choice for powering air compressors.

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• 4.

### The compressed air in an air brake system is stored in?

• A.

The vehicle's air tanks

• B.

The air compressor governor

• C.

The brake chambers

• D.

Belts and chains

A. The vehicle's air tanks
Explanation
In an air brake system, the compressed air is stored in the vehicle's air tanks. These tanks act as reservoirs to store the compressed air that is generated by the air compressor. The compressed air is then used to apply the brakes when the driver activates the brake pedal. The air tanks ensure that there is a sufficient supply of compressed air available for the brake system to function effectively.

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• 5.

### Alcohol evaporators may be used to?

• A.

Add water to the air brake system to prevent freezing

• B.

Heat the air brake system to help prevent freezing

• C.

Helps prevent moisture in the air brake system from freezing

• D.

Remove water vapor from the air brake system

C. Helps prevent moisture in the air brake system from freezing
Explanation
Alcohol evaporators help prevent moisture in the air brake system from freezing. Moisture can accumulate in the air brake system, and in cold temperatures, it can freeze and cause issues with the brakes. Alcohol evaporators are used to introduce alcohol into the system, which lowers the freezing point of the moisture, preventing it from freezing and causing malfunctions.

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• 6.

### When a spring brake chamber has been disabled by a 'caging bolt' or other mechanism?

• A.

It looks the same to a driver

• B.

The spring brake will still apply

• C.

The service brake will not apply

• D.

The spring brake will not apply

D. The spring brake will not apply
Explanation
When a spring brake chamber has been disabled by a 'caging bolt' or other mechanism, the spring brake will not apply. This means that the spring brake will not engage or activate when the brakes are applied. This can be dangerous as the vehicle may not be able to come to a complete stop or may experience difficulty in braking effectively. It is important for drivers to be aware of this and ensure that the spring brake is functioning properly to maintain safety on the road.

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• 7.

### Trailer couplers or 'gladhands' are usually?

• A.

Painted the same colour as the vehicle

• B.

Cross-connected when colours are matched

• C.

Yellow and black to avoid cross-connection

• D.

Colour matched and designed to prevent cross-connection

D. Colour matched and designed to prevent cross-connection
Explanation
Trailer couplers or 'gladhands' are color matched and designed to prevent cross-connection. This means that the couplers on the trailer and the vehicle will have matching colors, typically yellow and black, to ensure that they are connected correctly. The color matching helps to prevent any potential cross-connection between the air lines of different trailers, which could cause issues with the braking system. By using color matching and designing the couplers to prevent cross-connection, it ensures that the trailers can be safely and securely connected to the vehicle.

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• 8.

### Brake fade can result from?

• A.

High brake temperatures

• B.

High air compressor temperature

• C.

High air brake system pressure

• D.

Driving at high altitudes

A. High brake temperatures
Explanation
Brake fade occurs when the brakes become overheated, causing a decrease in braking effectiveness. High brake temperatures can lead to this condition, as the excessive heat can cause the brake pads and rotors to lose their frictional properties. This can occur during prolonged or heavy braking, such as when driving downhill or towing heavy loads. The heat generated during braking can also cause brake fluid to boil, further reducing braking performance. Therefore, high brake temperatures are a common cause of brake fade.

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• 9.

### Anti-lock braking systems (ABS) use warning indicator lights to indicate?

• A.

The system temperature

• B.

Malfunctions of the system

• C.

Wheel skidding

• D.

None of the above

B. Malfunctions of the system
Explanation
Anti-lock braking systems (ABS) use warning indicator lights to indicate malfunctions of the system. These indicator lights are designed to alert the driver when there is a problem with the ABS, such as a sensor failure or a malfunction in the hydraulic system. By illuminating the warning light, the ABS system is able to communicate to the driver that there is an issue that needs to be addressed. This allows the driver to take appropriate action, such as seeking repairs or maintenance, to ensure the ABS is functioning properly and their vehicle is safe to drive.

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• 10.

### When a vehicle's brakes do not comply with the Ontario Highway Traffic Act and regulations?

• A.

Only the driver may be charged

• B.

Only the vehicle operator may be charged

• C.

The driver will not be charged

• D.

Both the vehicle operator and the driver may be charged

D. Both the vehicle operator and the driver may be charged
Explanation
When a vehicle's brakes do not comply with the Ontario Highway Traffic Act and regulations, both the vehicle operator and the driver may be charged. This means that both the person operating the vehicle and the person driving the vehicle can be held responsible for the non-compliance of the brakes. The responsibility is shared between these two individuals, and they may face charges accordingly.

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• 11.

### Drivers must be careful when conducting an inspection of the air brake system to avoid?

• A.

Unexpected vehicle movement

• B.

Compressed air exhausting from components

• C.

Moving vehicle parts

• D.

All of the above

D. All of the above
Explanation
When conducting an inspection of the air brake system, drivers must be careful to avoid unexpected vehicle movement, compressed air exhausting from components, and moving vehicle parts. This is because any of these scenarios can be potentially dangerous and can lead to accidents or injuries. Therefore, it is important for drivers to exercise caution and take necessary precautions while inspecting the air brake system to ensure their safety and the safety of others on the road.

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• 12.

### When inspecting ,  the driver must look for?

• A.

Brake calipers or rotors that are not the same colour

• B.

Broken or cracked brake drums or rotors

• C.

Brake drums or shoes that are not the correct size

• D.

Square ports and markings

B. Broken or cracked brake drums or rotors
Explanation
When inspecting, the driver must look for broken or cracked brake drums or rotors. This is important because any damage to the brake drums or rotors can affect the braking performance of the vehicle. Cracks or breaks in these components can lead to reduced braking power or even complete brake failure, posing a serious safety risk. Therefore, it is crucial for the driver to identify and address any issues with the brake drums or rotors during inspection to ensure the proper functioning of the braking system.

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• 13.

### An air compressor governor should cut-in approximately 138 to 173 kPa (20 to 25 psi)?

• A.

Below cut-out pressure setting

• B.

Above cut-in pressure setting

• C.

Above cut-out pressure setting

• D.

Below cut-in pressure setting

A. Below cut-out pressure setting
Explanation
The correct answer is "Below cut-out pressure setting." This means that the air compressor governor should start operating and allow air to flow into the system when the pressure drops below the cut-out pressure setting. This ensures that the compressor kicks in and provides air when it is needed to maintain the desired pressure level.

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• 14.

### The air loss rate on a single vehicle (bus, tractor or truck) must not exceed?

• A.

21 kPa (3 psi) per minute

• B.

41 kPa (6 psi) per minute

• C.

55 kPa (8 psi) per minute

• D.

7 kPa (1 psi) per minute

A. 21 kPa (3 psi) per minute
Explanation
The air loss rate on a single vehicle must not exceed 21 kPa (3 psi) per minute. This is important because excessive air loss can lead to a decrease in braking efficiency, which can be extremely dangerous on the road. It is crucial for vehicles to maintain a stable air pressure system to ensure optimal braking performance and overall safety.

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• 15.

### When an air brake brake system is defective you must?

• A.

Drive the vehicle slowly on the highway

• B.

Drive the vehicle to the nearest service station

• C.

Drive the vehicle back to the terminal

• D.

Not drive or operate the vehicle on any road or highway

D. Not drive or operate the vehicle on any road or highway
Explanation
When an air brake brake system is defective, it is unsafe to drive or operate the vehicle on any road or highway. This is because the brakes are a critical component of a vehicle's safety system, and if they are not functioning properly, it can lead to accidents or loss of control. Therefore, it is necessary to refrain from driving the vehicle until the brake system is repaired or replaced.

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• 16.

### A reliable method for inspecting brake adjustment on a brake having an exposed push rod is?

• A.

Measuring the applied push rod stroke

• B.

Checking air pressure drop on brake application

• C.

Checking for a 90-degree angle when brakes are applied

• D.

Rolling the vehicle forward and applying the brakes

A. Measuring the applied push rod stroke
Explanation
Measuring the applied push rod stroke is a reliable method for inspecting brake adjustment on a brake with an exposed push rod. This involves measuring the distance the push rod moves when the brakes are applied. If the stroke is within the recommended range, it indicates that the brake adjustment is correct. However, if the stroke is too long or too short, it indicates that the brake adjustment needs to be adjusted. This method allows for a direct measurement of the push rod stroke, providing a reliable way to assess brake adjustment.

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• 17.

### When , air pressure must be between?

• A.

690 and 828 kPa (100 and 120 psi)

• B.

621 and 690 kPa (90 and 100 psi)

• C.

690 and 932 kPa (100 and 135 psi)

• D.

414 and 828 kPa (60 and 120 psi)

B. 621 and 690 kPa (90 and 100 psi)
Explanation
Diagram 11-1: Air pressure above 621 kPa (90 psi) with spring brakes released

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• 18.

### A brake having an exposed push rod is out of adjustment when?

• A.

The push rod stoke exceeds the adjustment limit of the brake chamber

• B.

The angle between the slack adjuster and push rod is less than 90 degrees

• C.

The angle between the slack adjuster and push rod is more than 90 degrees

• D.

Air pressure drops more than 55 kPa (8 psi when brakes are applied

A. The push rod stoke exceeds the adjustment limit of the brake chamber
Explanation
When the push rod stroke exceeds the adjustment limit of the brake chamber, it means that the push rod has extended too far and is not properly adjusted. This can lead to ineffective braking and potentially cause safety issues. It is important to ensure that the push rod is adjusted within the specified limits to maintain proper brake function.

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• 19.

### Repair and re-adjustment of all types of air brakes may be performed by?

• A.

• B.

Certified drivers

• C.

Certified technician

• D.

Drivers with a valid air brake endorsement

C. Certified technician
Explanation
The repair and re-adjustment of all types of air brakes should be performed by a certified technician. This ensures that the individual has the necessary knowledge and expertise to safely and effectively handle the complex systems involved in air brakes. Licensed drivers and drivers with a valid air brake endorsement may have some understanding of air brakes, but they may not have the comprehensive training and skills required to perform repairs and adjustments. Certified technicians have undergone specific training and have the necessary certifications to handle these tasks.

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• 20.

### Air tanks must be drained regularly because?

• A.

This is where moisture and oil collect

• B.

Tanks will develop too much pressure

• C.

Tanks will overheat

• D.

This is where primary and secondary air collect

A. This is where moisture and oil collect
Explanation
Air tanks must be drained regularly because moisture and oil collect in them. Moisture and oil can accumulate in the air tanks due to condensation and oil carryover from the compressor. If not drained regularly, this can lead to corrosion and damage to the tank, as well as affect the performance of the air system. Draining the tanks helps to remove the accumulated moisture and oil, ensuring the proper functioning and longevity of the air tanks.

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• 21.

### The brake pedal in an air brake system is used to?

• A.

Apply vehicle spring brakes

• B.

Raise and lower air brake system pressure

• C.

Apply vehicle service brakes

• D.

Apply trailer service brakes only

C. Apply vehicle service brakes
Explanation
The brake pedal in an air brake system is used to apply the vehicle service brakes. When the driver presses the brake pedal, it activates the air brake system, causing air pressure to be released from the brake chambers. This pressure then applies the brake shoes or pads to the brake drums or rotors, creating friction and slowing down the vehicle. Therefore, the brake pedal is responsible for applying the brakes and bringing the vehicle to a stop.

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• 22.

### A spring brake control valve is normally?

• A.

Located in the same position in all commerical vehicles

• B.

Pulled to release and pushed to apply the service brake

• C.

A toggle-type valve located in the same position in all vehicles

• D.

A push/pull type valve located near the driver

D. A push/pull type valve located near the driver
Explanation
A spring brake control valve is a push/pull type valve located near the driver. This type of valve is commonly used in commercial vehicles to control the spring brakes. By pulling the valve, the spring brakes are released, allowing the vehicle to move. On the other hand, pushing the valve applies the service brake, causing the vehicle to stop. The location of this valve near the driver ensures easy access and control over the spring brakes, enhancing safety and convenience.

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• 23.

### When trailer couplers or gladhands are cross-connected?

• A.

Trailer service and spring brakes will function correctly

• B.

The trailer spring brakes will release and function correctly

• C.

Trailer service and spring brakes will not function correctly

• D.

Trailer service brakes will function correctly

C. Trailer service and spring brakes will not function correctly
Explanation
When trailer couplers or gladhands are cross-connected, the correct answer is that the trailer service and spring brakes will not function correctly. Cross-connecting the couplers or gladhands can lead to a loss of air pressure in the brake system, causing the brakes to fail. This can be extremely dangerous as it can result in a loss of control over the trailer and increase the risk of accidents. It is important to ensure that the couplers and gladhands are properly connected to prevent any issues with the brake system.

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• 24.

### A vehicle's brakes must do more work when?

• A.

The vehicle carries less weight

• B.

The vehicle goes slower

• C.

The vehicle carries more weight

• D.

All of the above

C. The vehicle carries more weight
Explanation
When a vehicle carries more weight, the brakes have to work harder to slow down or stop the vehicle. This is because the additional weight increases the momentum and inertia of the vehicle, requiring more force from the brakes to overcome it. Similarly, when a vehicle carries less weight or goes slower, the brakes do not have to work as hard because there is less momentum and inertia to overcome. Therefore, the correct answer is that the vehicle carries more weight.

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• 25.

### When brake chamber push rod stoke exceeds the adjustment limit?

• A.

The spring brakes will still work normally

• B.

Vehicle stopping distances became shorter

• C.

Vehicle braking capacity will increase

• D.

Braking ability is reduced

D. Braking ability is reduced
Explanation
When the brake chamber push rod stroke exceeds the adjustment limit, it means that the brakes are not properly adjusted. This can result in reduced braking ability because the brakes may not engage fully or evenly. As a result, the vehicle may take longer to stop or may not be able to stop effectively, leading to a decrease in braking ability.

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• 26.

### Air brake systems must comply with the Ontario Highway Traffic Act and regulations?

• A.

Only when vehicle is being tested

• B.

Only during an annual safety inspection

• C.

Only when they are inspected by enforcement personnel

• D.

At all times when being driven or operated on any road or highway

D. At all times when being driven or operated on any road or highway
Explanation
Air brake systems must comply with the Ontario Highway Traffic Act and regulations at all times when being driven or operated on any road or highway. This means that the air brake systems on vehicles must meet the requirements set forth by the Act and regulations whenever they are in use on public roads. This ensures the safety and proper functioning of the air brake systems, which are essential for the safe operation of the vehicle. Compliance with these regulations is necessary to prevent accidents and maintain the overall safety of the roadways.

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• 27.

### When conducting an inspection of the air brake system, the vehicle should be parked securely on a?

• A.

Hill with the wheels turned toward the curd

• B.

Level surface and in any location

• C.

Hill with the wheels turned away from the curb

• D.

Level surface and in a safe location

D. Level surface and in a safe location
Explanation
When conducting an inspection of the air brake system, it is important to park the vehicle securely on a level surface and in a safe location. This ensures that the vehicle is stable and not at risk of rolling or causing any accidents during the inspection. Parking on a level surface allows for accurate assessment of the air brake system, as any abnormalities or issues can be easily detected. Additionally, parking in a safe location ensures the safety of the inspector and other individuals nearby, minimizing any potential hazards that may arise during the inspection process.

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• 28.

### When inspecting the foundation brake components, the driver must look for

• A.

Brake lining that is not against the drum when brakes are applied

• B.

Brake lining that is too thin or cracked

• C.

Grease or oil on the brake lining

• D.

All of the above

D. All of the above
Explanation
When inspecting the foundation brake components, the driver must look for brake lining that is not against the drum when brakes are applied. This is important because if the brake lining is not making proper contact with the drum, it will not be able to effectively stop the vehicle. The driver must also look for brake lining that is too thin or cracked, as this can indicate that the brake lining is worn out and needs to be replaced. Additionally, the driver should check for grease or oil on the brake lining, as this can reduce the friction between the brake lining and the drum, resulting in reduced braking performance. Therefore, all of the above options are important factors to consider when inspecting foundation brake components.

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• 29.

### When inspecting visible air brake hoses and tubes, the driver check for?

• A.

Audile air leak

• B.

Damaged or worn air line

• C.

Improper fitting used to connect or repair an air line

• D.

All of the above

D. All of the above
Explanation
When inspecting visible air brake hoses and tubes, the driver checks for audile air leaks, damaged or worn air lines, and improper fittings used to connect or repair an air line. This is because all of these issues can affect the proper functioning of the air brake system and compromise the safety of the vehicle. Therefore, the driver should inspect for all of these potential problems during the inspection process.

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• 30.

### To test the low air warning device, the ignition switch must be turned on and air pressure must be?

• A.

Raised from the normal operating range until the device activites

• B.

Raised from zero until the device de-activites

• C.

Reduced from the normal operating until the device activites

• D.

Reduced from 414kPa(60 psi) until the device de-activies

C. Reduced from the normal operating until the device activites
Explanation
To test the low air warning device, the air pressure needs to be reduced from the normal operating range until the device activates. This is because the low air warning device is designed to alert the driver when the air pressure in the braking system falls below a certain level. By reducing the air pressure from the normal operating range, it simulates a situation where there is a potential problem with the braking system, and if the device activates, it indicates that the warning system is functioning correctly.

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• 31.

### Air compressor cut-in pressure must never be less than?

• A.

414 kPa (60 psi)

• B.

828 kPa (120 psi)

• C.

552 kPa (80 psi)

• D.

932 kPa (135 psi)

C. 552 kPa (80 psi)
Explanation
The cut-in pressure of an air compressor refers to the minimum pressure at which the compressor starts running to build up pressure. It is important for the cut-in pressure to be set at an appropriate level to ensure the efficient operation of the compressor. In this case, the correct answer is 552 kPa (80 psi). This means that the compressor should start running when the pressure drops to 552 kPa or below. Setting the cut-in pressure too low could result in the compressor constantly starting and stopping, leading to inefficiency and unnecessary wear and tear on the equipment.

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• 32.

### The air loss rate on a towing vehicle with two or more trailers must not exceed?

• A.

28 kPa (4 psi) per minute

• B.

41 kPa (6 psi) per minute

• C.

55 kPa (8 psi) per minute

• D.

7 kPa (1 psi) per minute

B. 41 kPa (6 psi) per minute
Explanation
The correct answer is 41 kPa (6 psi) per minute. This is the maximum allowable air loss rate for a towing vehicle with two or more trailers. It is important to maintain proper air pressure in the braking system to ensure safe and effective braking. If the air loss rate exceeds this limit, it could indicate a problem with the braking system that needs to be addressed.

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• 33.

### When an air brake system is defective you must?

• A.

Drive the vehicle slowly on the highway

• B.

Drive the vehicle to the nearest service station

• C.

Drive the vehicle back to the terminal

• D.

Not drive or operate the vehicle on any road or highway

D. Not drive or operate the vehicle on any road or highway
Explanation
When an air brake system is defective, it is unsafe to drive or operate the vehicle on any road or highway. Defective air brakes can lead to a loss of braking power, making it difficult to stop the vehicle safely. Continuing to drive in such conditions can pose a significant risk to the driver, passengers, and other road users. It is crucial to address the issue promptly by seeking professional help or having the vehicle towed to a service station for repairs.

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• 34.

### A reliable method for inspecting brake adjustment on a brake having an exposed push rod is?

• A.

Measuring the applied push rod stroke

• B.

Checking air pressure drop on brake application

• C.

Checking for a 90-degree angle when brakes are applied

• D.

Rolling the vehicle forward and applying the brakes

A. Measuring the applied push rod stroke
Explanation
Measuring the applied push rod stroke is a reliable method for inspecting brake adjustment on a brake with an exposed push rod. This involves measuring the distance that the push rod moves when the brakes are applied. By comparing this measurement to the manufacturer's specifications, one can determine if the brake adjustment is within the recommended range. This method allows for a direct assessment of the brake's performance and can help identify any potential issues with the brake system.

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• 35.

### When measuring the applied push rod stroke on brake having exposed push rods, air pressure must be between?

• A.

690 and 828 kPa (100 and 120 psi)

• B.

621 and 690 kPa (90 and 100 psi)

• C.

690 and 932 kPa (100 and 135 psi)

• D.

414 and 828 kPa (60 and 120 psi)

B. 621 and 690 kPa (90 and 100 psi)
Explanation
The correct answer is 621 and 690 kPa (90 and 100 psi). This range of air pressure is required when measuring the applied push rod stroke on a brake with exposed push rods. It is important to have the correct air pressure to ensure accurate measurements and proper functioning of the brake system.

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• 36.

### When a driver finds a brake that is out of adjustment?

• A.

The vehicle must not be driven or operated on any road or highway

• B.

It must be corrected before entering an inspection station

• C.

It must be corrected at the next annual inspection

• D.

It must be corrected the next time the vehicle is serviced

A. The vehicle must not be driven or operated on any road or highway
Explanation
If a driver finds a brake that is out of adjustment, the correct course of action is to not drive or operate the vehicle on any road or highway. This is because an improperly adjusted brake can affect the vehicle's ability to stop effectively, posing a safety risk to the driver, passengers, and other road users. It is important to address the issue before using the vehicle again to ensure safe operation.

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• 37.

### The brake systems on  most large commerical vehicles use?

• A.

Compressed air to apply the brakes

• B.

Steam to apply the brakes

• C.

Water to apply the brakes

• D.

Brake fluid to apply the brakes

A. Compressed air to apply the brakes
Explanation
Most large commercial vehicles use compressed air to apply the brakes. This is known as an air brake system. In this system, air is stored in a tank and when the brake pedal is pressed, the air is released to activate the brake mechanism. Compressed air is used because it can provide a consistent and reliable force to apply the brakes, especially for heavy vehicles that require a higher braking force. Steam and water are not commonly used in brake systems, and while brake fluid is used in some vehicles, it is not the primary choice for large commercial vehicles.

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• 38.

### A governor controls air compressor?

• A.

Temperature

• B.

Speed and pressure

• C.

Cut-in and Cut-out pressures

• D.

Temperature and speed

C. Cut-in and Cut-out pressures
Explanation
Cut-in and cut-out pressures refer to the pressure levels at which an air compressor starts and stops operating. The governor is responsible for controlling these pressure levels. When the pressure drops below the cut-in pressure, the governor activates the compressor to start, and when the pressure reaches the cut-out pressure, the governor stops the compressor. Therefore, the governor plays a crucial role in controlling the operation of the air compressor based on the cut-in and cut-out pressures.

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• 39.

### To check the air pressure in a vehicle's air brake system, a driver?

• A.

Reads the gauges on the instrument panel

• B.

Makes a full brake application

• C.

Operates the engine at fast idle

• D.

Waits for governor cut-out

A. Reads the gauges on the instrument panel
Explanation
To check the air pressure in a vehicle's air brake system, a driver reads the gauges on the instrument panel. This is because the air pressure gauges on the instrument panel display the current air pressure in the air brake system. By monitoring these gauges, the driver can ensure that the air pressure is within the appropriate range for safe braking. This allows the driver to take necessary actions, such as adding air or releasing air, to maintain the proper air pressure in the system.

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• 40.

### Are?

• A.

Used to reduce the force of the service brakes on the front steering axle

• B.

Only found on new vehicles to disable steering brakes

• C.

Used to limit the number of times that brakes can be applied

• D.

Used to reduce the brake force on trailer axle brakes

A. Used to reduce the force of the service brakes on the front steering axle
Explanation
This feature is used to decrease the amount of force applied to the service brakes on the front steering axle. This can help prevent the front wheels from locking up or skidding during braking, which could result in a loss of steering control. By reducing the brake force on the front steering axle, the vehicle is able to maintain better stability and maneuverability while braking.

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• 41.

### When air brake system pressure drops below 414 kPa (60 psi), the spring brakes?

• A.

Will automatically release

• B.

Will automatically apply

• C.

Must be manully applies

• D.

Must be manually released

B. Will automatically apply
Explanation
When the air brake system pressure drops below 414 kPa (60 psi), the spring brakes will automatically apply. This is because the spring brakes are designed to engage and apply the brakes when there is a loss of air pressure in the system. This is a safety feature that ensures the vehicle comes to a stop in case of a failure or loss of air pressure in the brake system.

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• 42.

### The trailer hand valve is used to?

• A.

Release the trailer spring brakes

• B.

Apply the trailer spring brakes

• C.

Release the towing vehicle spring brakes

• D.

Apply the trailer service brakes

D. Apply the trailer service brakes
Explanation
The trailer hand valve is used to apply the trailer service brakes. This means that when the hand valve is activated, it will activate the brakes on the trailer, allowing the driver to slow down or stop the trailer independently from the towing vehicle.

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• 43.

### A vehicle's brakes must do more work when?

• A.

The vehicle goes slower

• B.

The vehicle goes faster

• C.

The vehicle carries less weight

• D.

None of the above

B. The vehicle goes faster
Explanation
When a vehicle goes faster, the brakes must do more work to slow down or stop the vehicle due to the increased momentum and kinetic energy. As the speed increases, it takes more force and distance for the brakes to bring the vehicle to a halt. Therefore, the correct answer is "The vehicle goes faster."

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• 44.

### Using anti-lock braking systems (ABS) to prevent the wheels from locking?

• A.

Causes the brakes to go out of adjustment more easily

• B.

Helps maintain steering control during emergency braking

• C.

Causes poor steering and directional stability in all driving situations

• D.

Can cause loss of steering control

B. Helps maintain steering control during emergency braking
Explanation
Using anti-lock braking systems (ABS) helps maintain steering control during emergency braking. ABS prevents the wheels from locking up, allowing the driver to maintain control and steer the vehicle while braking hard. This is especially important in emergency situations where sudden braking is required to avoid a collision. Without ABS, locked wheels can cause the vehicle to skid and lose steering control, increasing the risk of an accident. ABS technology helps to prevent this by modulating the braking pressure on each wheel, ensuring that the wheels continue to rotate and maintain traction with the road surface.

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• 45.

### To prevent vehicle movement during an inspection of the air brake system, a driver should use?

• A.

The service brakes

• B.

The spring brakes

• C.

Wheel chocks or blocks

• D.

The brake pedal

C. Wheel chocks or blocks
Explanation
To prevent vehicle movement during an inspection of the air brake system, a driver should use wheel chocks or blocks. Wheel chocks or blocks are devices placed against the wheels of a vehicle to prevent it from rolling or moving. They provide an additional level of safety by immobilizing the vehicle, ensuring that it remains stationary while the inspection is being carried out. This helps to prevent accidents or injuries that could occur if the vehicle were to unexpectedly move during the inspection process.

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• 46.

### When inspecting the , the driver must look for?

• A.

Air leaks, cracks and manufactured holes

• B.

Manufactured air leaks and cracks

• C.

Contaminated brake lining

• D.

Air leaks, cracks and non-manufactured holes

D. Air leaks, cracks and non-manufactured holes
Explanation
When inspecting the brake system, the driver must look for air leaks, cracks, and non-manufactured holes. This is important because any of these issues can lead to a loss of brake pressure or compromised braking ability, which can be extremely dangerous. Air leaks can cause the brake system to become less efficient, while cracks and non-manufactured holes can weaken the structure of the brake components. Therefore, it is crucial for the driver to thoroughly inspect the brake system for these potential problems to ensure safe operation of the vehicle.

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• 47.

### When inspecting the air tanks, the driver must look for?

• A.

Loose air compressor governor

• B.

Improperly spliced air line

• C.

Insecurely mounted air tank

• D.

None of the above

C. Insecurely mounted air tank
Explanation
The driver must inspect the air tanks for any signs of insecure mounting. This means checking if the air tanks are properly secured and not loose or unstable. This is important to ensure the safety and stability of the vehicle's air system. A loose or insecurely mounted air tank can lead to air leaks or other malfunctions, which can affect the braking system and overall vehicle performance. Therefore, it is crucial for the driver to look for this issue during the inspection.

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• 48.

### The low air warning device must activate before air pressure drops to?

• A.

621 kPa (90 psi)

• B.

518 kPa (75 psi)

• C.

380 kPa (55 psi)

• D.

311 kPa (45 psi)

C. 380 kPa (55 psi)
Explanation
The low air warning device is a safety feature in vehicles that alerts the driver when the air pressure in the braking system drops to a dangerously low level. This is important because if the air pressure drops too low, the brakes may not function properly, leading to a potential loss of control of the vehicle. The correct answer is 380 kPa (55 psi) because this is the minimum air pressure at which the warning device should activate, ensuring that the driver is alerted before the pressure drops to a critical level.

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• 49.

### A properly functioning air brake system?

• A.

Will lose air at a noticeable rate

• B.

Has many noticeable air leaks

• C.

Will lose air at a noticeable rate when the engine is not running

• D.

Should not have any noticable air leaks

D. Should not have any noticable air leaks
Explanation
A properly functioning air brake system should not have any noticeable air leaks. Air leaks can lead to a decrease in brake efficiency and can compromise the overall performance of the system. Therefore, it is important for an air brake system to be free from any leaks to ensure safe and effective braking.

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• 50.

### When air loss from an air brake system exceeds the prescribed limits?

• A.

The vehicle must be driven slowly on the highway

• B.

The vehicle may not be driven on any road or highway

• C.

The vehicle must be driven to the nearest service centre

• D.

The vehicle must be driven only on secondary roads

B. The vehicle may not be driven on any road or highway
Explanation
When air loss from an air brake system exceeds the prescribed limits, it is not safe to drive the vehicle on any road or highway. This is because the air brake system is essential for the safe operation of the vehicle, and if there is excessive air loss, the brakes may not function properly, putting the driver, passengers, and other road users at risk. Therefore, it is necessary to address the issue and have the vehicle repaired before it can be driven again.

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• Current Version
• Mar 20, 2023
Quiz Edited by
ProProfs Editorial Team
• Aug 18, 2013
Quiz Created by
Victorpal

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