ASE A5 Brakes Practice Test

1. A vehicle with a Hydroboost brake system has reduced braking performance. Which of the following is causing this poor performance?

  • A. Low manifold vacuum.
  • B. A faulty vacuum check valve.
  • C. A clogged inlet valve.
  • D. A faulty power steering pump.

1.

Answer A is wrong. Hydroboost brake units use power steering pressure instead of engine vacuum for brake assist.

Answer B is wrong. The vacuum check valve controls the flow of vacuum to a vacuum power booster.

Answer C is wrong. A clogged inlet valve blocks or slows the airflow into a vacuum booster.

Answer D is correct. The power steering pump produces pressure for the Hydroboost brake assist unit.

2. A vehicle with a vacuum booster has a hard brake pedal. Which of the following is LEAST likely to cause this condition?

  • A. The master cylinder.
  • B. The vacuum check valve.
  • C. A clogged check valve hose.
  • D. Low manifold vacuum.

2.

Answer A is correct. Faulty master cylinders do not typically result in a hard brake pedal. It is more common for a faulty master cylinder to cause a low brake pedal that fades to the floor as it is applied. The master cylinder is the least likely component listed to result in a hard brake pedal.

Answer B is wrong. A faulty vacuum check valve will result in a hard brake pedal.

Answer C is wrong. A clogged check valve hose will result in a hard brake pedal.

Answer D is wrong. Low intake manifold pressure will result in a hard brake pedal. Answers B, C, and D are all parts of the vacuum assist brake system.

3. A vehicle pulls to the left only when the brakes are applied. This condition is MOST likely caused by:

  • A. A seized left front caliper.
  • B. A restriction in the left front brake line.
  • C. Leaking master cylinder cup seals.
  • D. A seized right front caliper.

3.

Answer A is wrong. A frozen left front caliper will cause the vehicle to pull to the right when braking.

Answer B is wrong. A restriction in the left front brake line will cause the left front brake to drag after the brakes are released. After the brake pedal is released, hydraulic pressure remains on the caliper side of the restriction leaving the left brake unit engaged.

Answer C is wrong. Leaking master cylinder cup seals result in an internal leak causing a loss in pressure and the pedal to fade to the floor when braking.

Answer D is correct. A frozen right front caliper will cause the vehicle to pull to the left when braking.

4. A technician has inspected the brakes of a front disc rear drum brake system and found that the brake shoes are worn and require replacement. All of the following statements are correct about brake shoe replacement EXCEPT:

  • A. The primary shoe faces the front of the vehicle.
  • B. The secondary shoe has a shorter brake shoe lining.
  • C. The secondary shoe faces the rear of the vehicle.
  • D. Shoe lining can be riveted or glued to the shoe.

4.

Answer A is wrong. The primary shoe faces the front of the vehicle.

Answer B is correct. The shoe with the shorter lining (the primary shoe) faces the front of the vehicle.

Answer C is wrong. The secondary shoe faces the rear of the vehicle.

Answer D is wrong. Shoe lining can be riveted or glued to the shoe.

5. Technician A says ABS control units are programmed to ignore speed sensor input variations below a certain threshold. Technician B says a one-channel ABS brake system controls hydraulic pressure to the rear brake units. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

5.

Answer A is wrong. Minor variations in speed sensor input are not acted upon by the system.

Answer B is wrong. These systems use one sensor to control the two rear wheels.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.