Question 1

The residual pressure check valve is used in the hydraulic circuit for ______ brakes.

Accepted Answer

A)   disc
B)   drum
C)   both "disc" and "drum"
D)   neither "disc" nor "drum" B

Question 2

List two ways of improving heat dissipation on a disc brake.

Accepted Answer

ventilated rotors
cross drilled rotors
cool air ducting to the rotor hub area

Question 3

Name three types of brake lining friction materials.

Accepted Answer

NAO, non asbestos organic
fully metallic
semimetallic
synthetic
fiberglass
aramid fiber
carbon metallic
ceramic

Question 4

All manufacturers recommend a specific sequence to follow when bleeding a vehicle's brakes.

Accepted Answer

A) True 
 B)False

Question 5

After replacing a vacuum booster, the brakes lock up on a road test. Technician A says there is air trapped inside the brake lines. Technician B says the power booster pushrod needs adjustment. Who is correct?

Accepted Answer

A)   A only
B)   B only
C)   both A and B
D)   neither A nor B

Question 6

The brake system converts the momentum of the vehicle into ____________________.

Accepted Answer

The answer of The brake system converts the momentum of...

Question 7

The actuator lever on the height-sensing proportioning valve is connected to the ____________________.

Accepted Answer

The answer of The actuator lever on the height-sensing proportioning...

Question 8

All brake fluids are hygroscopic-that is, they readily absorb water.

Accepted Answer

A) True 
 B)False

Question 9

On a disc/drum system, the rear drum brakes lock up when the brake pedal is pressed hard. Technician A says the proportioning valve may not be functioning. Technician B says the axle height valve may be out of adjustment. Who is correct?

Accepted Answer

A)   A only
B)   B only
C)   both A and B
D)   neither A nor B

Question 10

Asbestos has not been used in brake linings or pads since 2003.

Accepted Answer

A) True 
 B)False

Question 11

The owner of a vehicle complains the car is hard to stop. The technician doing the diagnosis starts by pumping the brake pedal several times with the engine off, and then starts the engine while holding firm pressure on the brake pedal. The pedal falls away slightly and less pressure is needed to maintain the pedal in any position. This test proves that ______.

Accepted Answer

A)   the master cylinder is working
B)   the vacuum booster is working
C)   the front brakes require adjustment
D)   there is air in the hydraulic system

Question 12

Brake lines are made of ______.

Accepted Answer

A)   seamless copper tubing
B)   extruded copper clad aluminum tubing
C)   double-wall steel tubing
D)   all answers are correct

Question 13

Master cylinders are generally not overhauled in the field. They are replaced with new or rebuilt master cylinders.

Accepted Answer

A) True 
 B)False

Question 14

A technician is diagnosing a vehicle with a braking system problem. When she removes the filler cap to check the fluid level in the master cylinder, she notices that the rubber seal on the cap is swollen and has begun to disintegrate. What could be the problem?

Accepted Answer

A)   water in the brake fluid
B)   petroleum-based lubricants in the fluid
C)   fluid overheating
D)   incorrect type of brake fluid

Question 15

An aluminum master cylinder ______.

Accepted Answer

A)   has a plastic fluid reservoir
B)   has an anodized bore
C)   is often called a composite master cylinder
D)   all answers are correct

Question 16

Fully metallic linings require very high pedal pressure and tend to quickly wear out drums and rotors.

Accepted Answer

A) True 
 B)False

Question 17

Identify the two dual brake system layouts.

Accepted Answer

The answer of Identify the two dual brake system layouts....

Question 18

A master cylinder that has a bulge at the rear, near the mounting flange, is a _____type master cylinder.

Accepted Answer

A)   self-compensating
B)   auto compensating
C)   dual stage
D)   quick take-up

Question 19

What type of power-assist unit uses pressure developed by an external pump, such as a power steering pump?

Accepted Answer

A)   hydraulic-assist
B)   vacuum-assist
C)   ABS
D)   ASC

Question 20

If the front hydraulic circuit fails on a front/rear split brake system, the vehicle will lose 50 percent of its braking power.

Accepted Answer

A) True 
 B)False

Exam 50: Brake Systems

The residual pressure check valve is used in the hydraulic circuit for ______ brakes.

List two ways of improving heat dissipation on a disc brake.

Name three types of brake lining friction materials.

All manufacturers recommend a specific sequence to follow when bleeding a vehicle's brakes.

After replacing a vacuum booster, the brakes lock up on a road test. Technician A says there is air trapped inside the brake lines. Technician B says the power booster pushrod needs adjustment. Who is correct?

The brake system converts the momentum of the vehicle into ____________________.

The actuator lever on the height-sensing proportioning valve is connected to the ____________________.

All brake fluids are hygroscopic-that is, they readily absorb water.

On a disc/drum system, the rear drum brakes lock up when the brake pedal is pressed hard. Technician A says the proportioning valve may not be functioning. Technician B says the axle height valve may be out of adjustment. Who is correct?

Asbestos has not been used in brake linings or pads since 2003.

Brake lines are made of ______.

Master cylinders are generally not overhauled in the field. They are replaced with new or rebuilt master cylinders.

A technician is diagnosing a vehicle with a braking system problem. When she removes the filler cap to check the fluid level in the master cylinder, she notices that the rubber seal on the cap is swollen and has begun to disintegrate. What could be the problem?

An aluminum master cylinder ______.

Fully metallic linings require very high pedal pressure and tend to quickly wear out drums and rotors.

Identify the two dual brake system layouts.

A master cylinder that has a bulge at the rear, near the mounting flange, is a _____type master cylinder.

What type of power-assist unit uses pressure developed by an external pump, such as a power steering pump?

If the front hydraulic circuit fails on a front/rear split brake system, the vehicle will lose 50 percent of its braking power.