Chapter 50 General Brakes Test Review

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

• ABS

• Hydraulic-assist

• ASC

• Vacuum-assist

2. Which of the following could cause an extremely hard brake pedal?

• a leaking diaphragm in the vacuum power booster

• use of the wrong fluid

• excessively worn brake pads

• air in the system

3. The power brakes in a vehicle are grabbing. Technician A checks for grease or oil on the brake shoe and pad linings. Technician B checks the fluid level in the master cylinder. Who is correct?

• A only

• B only

• Both A and B

• Neither A or B

4. On a disc/drum system, the rear drum brakes lock up when the 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 adjustments. Who is correct?

• A only

• B only

• Both A and B

• Neither A or B

5. 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?

• fluid overheating

• water in the break fluid

• petroleum-based lubricants in the fluid

• incorrect type of brake fluid

6. Brake lines are made of ______.

• All of the answers are correct

• double-wall steel tubing

• seamless copper tubing

• extruded copper clad aluminum tubing

7. A technician is diagnosing a car that had both front brake hoses replaced 5,000 miles ago. An inspection reveals that the right front brake hose has ruptured. Technician A says the specifications called for DOT 3 fluid; using DOT 4 fluid caused the failure. Technician B says the brake hose was twisted and stressed too much when installed. Who is correct?

• A only

• B only

• Both A and B

• Neither A or B

8. A metering valve is found only on cars and trucks with _____.

• four wheel disc brakes

• disc front and drum rear brakes

• four wheel drum brakes

• dual diagonal brake circuits

9. A technician is checking a car with an owner's complaint of poor braking performance and a low brake pedal. The master cylinder is full, and there are no signs of fluid leaks in the brake system. When he holds firm pressure on the brake pedal, the pedal slowly drops. What could be the problem?

• internally leaking caliper

• leaking wheel cylinder

• frozen pressure differential valve

• internally leaking master cylinder

10. A proportioning valve reduces fluid pressure to ______.

• the front brakes during hard braking

• the front brakes during initial brake (low pedal force) application

• the rear brakes during hard braking

• the rear brakes during the initial (low pedal force) brake application