Brakes(ASE Prep Tests)

1. A vehicle has power assist during engine operation, but it has no assist after the engine has been off and during initial engine startup. Technician A says a stuck close vacuum check valve could be the cause. Technician B says a leaking vacuum check valve could be the cause. Who is correct?

• A only

• B only

• Both A & B

• Neither A or B

2. Tire load ratings are being discussed. Technician A says bias ply tires can carry a larger load than radials. Technician B says a light truck may use 8-ply bias ply tires. Who is correct?

• A only

• B only

• Both A & B

• Neither A or B

3. Technician A says a restricted vacuum feed hose may cause loss of assist after several quick brake applications. Technician B says brake fluid in the vacuum feed hose indicates a leaking master cylinder seal. Who is correct?

• A only

• B only

• Both A & B

• Neither A or B

4. Technician A says that flushing the brakes is the removal of air from the system. Technician B says that bleeding the system is the complete replacement of all system brake fluid with new fluid. Who is correct?

• A only

• B only

• Both A & B

• Neither A or B

5. The operation of a height-sensing proportioning valve can be affected by the installation of:

• a. helper springs.

• b. air-assist shocks.

• c. new brake shoes or drums.

• d. both A and B.

6. A unique feature of the Continental Teves Mark 20E system is its use of:

• a. wheel speed sensors.

• b. a front/rear split system.

• c. an ICU.

• d. electronic brake proportioning.

7. Technician A says dragging brakes may be caused by an improperly adjusted pushrod. Technician B says a leaking air control valve in the vacuum booster could cause the brakes to be slightly applied at all times. Who is correct?

• a. A only

• b. B only

• c. Both A and B

• d. Neither A nor B

8. Technician A says brake tubing should be double flared or ISO flared. Technician B says an ISO tubing seat must be used with the ISO flare. Who is correct?

• A

• B

• C

• D

9. Brake pedal pressure is increased by all of following EXCEPT:

• a. the lever action of the brake pedal assembly.

• b. the size of the master cylinder pistons.

• c. power-assist units.

• d. the size of the brake rotor.

10. Brake balance is being discussed. Technician A says this is a serious challenge for small rear-wheel drive pickup trucks. Technician B says brake balance is the braking force between the front and rear brakes. Who is correct?

• A

• B

• C

• D