ASE A5 Brakes Practice Test

51. A vehicle with a Hydroboost brake system has reduced braking performance. Which of these could be the cause?

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

51.

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 vacuum flow 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.

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52. A vehicle with four-wheel disc brakes, ABS, and a vacuum brake booster has a hard brake pedal and an increased stopping distance. Which of the following is causing this condition?

  • A. Bypassing master cylinder cup seals.
  • B. A faulty brake booster.
  • C. Worn brake pads.
  • D. Air in the brake lines.

52.

Answer A is wrong. Bypassing master cylinder internal seals causes a low brake pedal that fades to the floor.

Answer B is correct. Symptoms of a faulty or leaking brake booster include a hard brake pedal, increased pedal effort, and an extended stopping distance.

Answer C is wrong. Worn brake pads result in a squeal when braking.

Answer D is wrong. Air in the brake lines results in a soft spongy brake pedal.

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53. A vehicle drifts to the right while driving forward. Which of these could be the cause?

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

53.

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.

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

Answer D is correct. The slide pins can stick in their bores, preventing sufficient braking force and causing the brake pad to drag and wear prematurely. As a result, while driving forward, the vehicle will drift or pull to the side with the dragging front brake.

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54. The brake shoes on a self-energizing drum brake system require replacement. All of the following statements are correct about replacing these brake shoes 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.

54.

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. Reversing the primary and secondary brake shoes results in noise, possible wheel lockup, and a pull to one side while driving forward.

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. Click or tap the Read more... button for an illustrated explanation.

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55. A vehicle has ABS and ESC warning lights and the brake lights remain on even after the pedal is released. Technician A says this could be caused by a faulty brake pedal position sensor. Technician B says a faulty brake pedal position sensor will affect the vehicle's Advanced Driver Assistance Systems (ADAS). Who is correct?

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

55.

Answer A is wrong. A failed brake pedal position sensor results in trouble codes, deactivation, and illumination of MIL ABS TCS ESC and brake system warning lights.

Answer B is wrong. ADAS automatic‑braking systems require far more detailed brake‑pedal data than a simple on/off brake‑light switch can provide.

Answer C is correct. When the BPPS fails, the control modules lose the continuous pedal‑position data they rely on. Without this input, the system may misinterpret pedal status, causing the brake lights to either fail to illuminate or remain on even after the pedal is released.

Answer D is wrong. Both technicians are correct.

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