# Auto 06 - Stop! Write This Quiz, Pt 1

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Ginmonk
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Quizzes Created: 9 | Total Attempts: 802
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The first of two quizzes on brakes and brake systems.

• 1.

### Why are front brakes changed more often than rear brakes?

• A.

Disc brakes aren’t as durable as drum brakes

• B.

It’s not true - rear brakes are changed more frequently

• C.

Front brakes have to work harder than rear brakes

• D.

Brakes don’t need to be changed

C. Front brakes have to work harder than rear brakes
Explanation
It's physics; as a vehicle slows down, more weight is transferred to the front wheels, which means more braking force is needed on the front. If equal braking force was put on the rear as well as the front, the rear wheels would likely lock up, and lose breaking power.

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• 2.

### How many pistons are found in a master cylinder?

• A.

One - the slave cylinder distributes the pressure

• B.

Two - one for each system

• C.

Three - in case the first two fail, there is a back up

• D.

Four - one for each wheel

B. Two - one for each system
Explanation
Modern master cylinders have pistons to drive two separate hydraulic circuits, either a front-rear divided circuit or a diagonally split circuit. The idea behind separate circuits is that if one fails, the other will likely still be functioning. "Safety redundancy"!

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• 3.

### Which type of disc brake has a piston on each side of the rotor?

• A.

Fixed caliper

• B.

Floating caliper

• C.

Sliding caliper

• D.

All disc brakes have pistons on each side of the rotor

A. Fixed caliper
Explanation
Fixed caliper means that only the pistons move to put pressure on each side of the disc. Sliding and floating caliper systems (essentially the same thing with different names) depend on the caliper moving to put pressure on both sides of the disc.

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• 4.

### How is rotor wear accommodated for on disc brakes?

• A.

Return springs

• B.

Square-cut O-ring

• C.

Hydraulic pressure

• D.

Centripetal force

B. Square-cut O-ring
Explanation
Square-cut rings allow the piston to advance as far as they need to to provide stopping forces, and only pull the piston back a certain amount, so as the disc wears, the pistons can keep advancing.

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• 5.

### The friction material on disc brakes are called what?

• A.

• B.

Shoes

• C.

Stoppers

• D.

Asbestos

Explanation
The friction material on disc brakes is called pads. Pads are made of a high-friction material, such as ceramic or semi-metallic compounds, that is pressed against the rotating disc to create friction and slow down or stop the vehicle. Pads are designed to withstand high temperatures and provide consistent braking performance. They are a crucial component of disc brake systems and need to be regularly inspected and replaced when worn out to ensure safe and effective braking.

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• 6.

### The two main types of drum brakes are called Duo-Servo and...

• A.

Single-Servo

• B.

Shoe-type

• C.

Non-Servo

• D.

Haploid

C. Non-Servo
Explanation
Non servo (also known as leading-trailing) type are the other main type of drum brakes. By the way; "shoe" is the name of the friction material on drum brakes, and "Haploids" have one set of chromosomes (n=1)... I lost interest after that.

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• 7.

### What is the function of the metering valve?

• A.

Measures how much brake fluid needs to be added to master cylinder

• B.

Measures amount of hydraulic pressure is applied to front and rear brakes

• C.

Measures amount of hydraulic fluid lost to evaporation

• D.

Delays front brake application until rear brakes are applied

D. Delays front brake application until rear brakes are applied
Explanation
The metering valve is responsible for delaying the application of the front brakes until the rear brakes are applied. This is important for maintaining proper balance and preventing the front brakes from engaging too quickly, which could lead to instability or loss of control. By delaying the front brake application, the metering valve helps ensure that the braking force is distributed evenly between the front and rear brakes, improving overall braking performance and stability.

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• 8.

### What does the proportioning valve do?

• A.

Automatically mixes water into brake fluid for correct dilution

• B.

Equalizes amount of hydraulic pressure is applied to front and rear brakes

• C.

Produces ‘feedback pressure’ to brake pedal.

• D.

Limits hydraulic pressure to rear brakes to prevent wheel lock-up

D. Limits hydraulic pressure to rear brakes to prevent wheel lock-up
Explanation
Under braking conditions, the weight of the vehicle shifts towards the front, leaving less weight over the rear wheels. With less weight, wheel lock-up is likely, and remains not desirable.

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• 9.

### Pressure differential switch does what?

• A.

Detects loss of pressure (leak) in a circuit and turns on warning light.

• B.

Electronically controls hydraulic pressure to front and rear brakes.

• C.

Electronically delays the application of the rear brakes

• D.

Electronically delays the application of the front brakes

A. Detects loss of pressure (leak) in a circuit and turns on warning light.
Explanation
If one circuit loses pressure, this switch senses the difference in hydraulic pressure and lights a warning light.

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• 10.

### Why are drum brakes easier to use as parking brakes than disc brakes?

• A.

They provide better friction for difficult parking situations

• B.

The hydraulics are less likely to fail than on disc brakes

• C.

It is easier to activate drum brakes using mechanical means

• D.

The front brakes are used more in parking brake situations