# Chapter #46 Review Questions On Disc Brakes

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| By Dakota067
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Dakota067
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Quizzes Created: 4 | Total Attempts: 6,052
Questions: 28 | Attempts: 183

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Car brakes are usually what stand between you and jumping a red light or hitting the car in front of you. Having covered the topic on brakes the various types and functionality you can now be seen as well equipped to handle them. Take up the quiz and gauge your understanding.

• 1.

### The proportioning valve holds off the front disc brakes.

• A.

True

• B.

False

B. False
Explanation
The proportioning valve does not hold off the front disc brakes. It is responsible for regulating the pressure of the brake fluid between the front and rear brakes to ensure balanced braking. This helps prevent the rear brakes from locking up during hard braking. Therefore, the correct answer is False.

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• 2.

### COF stands for (Cold Optimum Friction)

• A.

True

• B.

False

B. False
Explanation
The given statement is false. COF does not stand for "Cold Optimum Friction." COF actually stands for "Coefficient of Friction," which is a dimensionless quantity that represents the ratio of the force of friction between two bodies to the force pressing them together. The coefficient of friction is used to quantify the amount of friction between two surfaces and is an important factor in determining the ease or difficulty of movement between them.

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• 3.

### Aluminum master cylinders can be honed to a maximum size of .002

• A.

True

• B.

False

B. False
Explanation
Aluminum master cylinders cannot be honed to a maximum size of .002. This statement is false because aluminum is a soft metal and honing it to such a size would result in a weak and potentially unsafe master cylinder.

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• 4.

### Servo action is increasing the size of the master cylinder piston.

• A.

True

• B.

False

B. False
Explanation
Servo action actually reduces the effort required by the driver to apply the brakes. It achieves this by using a vacuum or hydraulic pressure to assist in applying force to the master cylinder piston. This assistance allows for a smaller master cylinder piston size, as the servo action amplifies the force exerted by the driver. Therefore, the given statement that servo action increases the size of the master cylinder piston is incorrect.

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• 5.

### If the brake pedal sinks slightly when the engine is started, this is a sign that the master cylinder is bypassing.

• A.

True

• B.

False

B. False
Explanation
If the brake pedal sinks slightly when the engine is started, it is not necessarily a sign that the master cylinder is bypassing. There can be other reasons for this issue, such as air in the brake lines or a faulty brake booster. Therefore, the statement is false.

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• 6.

### Residual check valves are used on diagonally split hydraulic systems.

• A.

True

• B.

False

B. False
Explanation
Residual check valves are not used on diagonally split hydraulic systems. Diagonally split hydraulic systems typically use a combination valve that includes a metering valve, proportioning valve, and pressure differential switch. The purpose of these valves is to ensure that the front and rear brakes receive the appropriate amount of hydraulic pressure to maintain proper braking balance. Residual check valves, on the other hand, are used to maintain a small amount of residual pressure in the brake system to prevent air from entering the lines and to keep the brake shoes or pads close to the drums or rotors.

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• 7.

### The compensating port is part of the combination valve.

• A.

True

• B.

False

B. False
Explanation
The compensating port is not part of the combination valve.

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• 8.

### The best way to tell if a hydraulic system is diagoinally split is to count the number of brake lines coming from the master cylinder.

• A.

True

• B.

False

B. False
Explanation
The statement is false because the number of brake lines coming from the master cylinder does not determine if a hydraulic system is diagonally split. Diagonal split refers to a braking system where the front left and rear right wheels are on one circuit, while the front right and rear left wheels are on another circuit. This arrangement provides better stability and control during braking. The number of brake lines may vary depending on the specific design of the hydraulic system, but it does not indicate whether it is diagonally split or not.

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• 9.

### To test a brake system for air have someone push the brake pedal while observing the fluid in the reservoir.

• A.

True

• B.

False

B. False
Explanation
The correct answer is False because to test a brake system for air, the correct procedure is to bleed the brake lines to remove any air bubbles. Observing the fluid in the reservoir while someone pushes the brake pedal will not provide an accurate indication of the presence of air in the brake system.

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• 10.

### An example of kinetic friction is a locked brake with no motion.

• A.

True

• B.

False

B. False
Explanation
The statement is false because kinetic friction is the force that opposes the relative motion between two surfaces in contact. In the given example, a locked brake with no motion would not have any relative motion between the brake pad and the wheel, so there would be no kinetic friction present.

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• 11.

### Dot 3 brake fluid is clear or amber

• A.

True

• B.

False

A. True
Explanation
Dot 3 brake fluid is clear or amber in color. This means that when you look at the brake fluid, it will either appear transparent or have a slight amber tint. The color of brake fluid can vary depending on the specific brand or manufacturer, but in general, Dot 3 brake fluid is clear or amber.

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• 28.

### Name 3 things that can turn on a red brake light.

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• Current Version
• Mar 20, 2023
Quiz Edited by
ProProfs Editorial Team
• Feb 28, 2009
Quiz Created by
Dakota067

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