ASE A5 Brakes Practice Test

36. Two technicians are discussing ABS hydraulic modulators. Technician A says the inlet valve is normally closed. Technician B says the outlet valve is normally open. Who is correct?

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


Answer A is wrong. The inlet valve is a normally open valve.

Answer B is wrong. The outlet valve is normally closed.

Answer C is wrong. Symptoms of faulty solenoid valves include a pull during emergency braking and a low brake pedal.

Answer D is correct. Neither technician is correct. A sticking or stuck closed inlet (isolation) valve will block the flow of brake fluid to a front caliper. As a result, the vehicle will pull to the opposite side when the brakes are applied.

37. The vehicle's brake pads are worn, and the brake pad wear indicator warning light is illuminated on the instrument panel. Which of the following is causing this condition?

  • A. The brake pad's metal warning clip.
  • B. The brake pad wear sensor.
  • C. The brake shoes.
  • D. The wheel bearing.


Answer A is wrong. The small metal clip makes an audible squealing sound when it contacts the rotor.

Answer B is correct. The pad warning light illuminates when the electric sensor's tip contacts the rotor. This usually means the sensor is damaged and needs replacement.

Answer C is wrong. The electric pad warning system is a less intrusive way of indicating pad wear to the driver. When this wired circuit is interrupted, the pad wear warning light illuminates on the instrument panel.

Answer D is wrong. Unfortunately, by the time the driver's light comes on, the sensor's circuit has already broken, requiring sensor replacement.

38. Which of the following flaws requires the replacement of a brake drum?

  • A. Minor pitting.
  • B. Slight scoring.
  • C. Small cracks.
  • D. Slightly out of round.


Answer A is wrong. When a drum shows signs of minor pitting, it may be machined.

Answer B is wrong. When a drum shows signs of minor scoring, it may be machined.

Answer C is correct. If a brake drum begins to crack, it cannot be machined and must be replaced. Small cracks lead to big ones, and the crack may be deeper in the cast than it appears.

Answer D is wrong. Measure the inside of the brake drum with a brake drum micrometer. Never turn a drum or rotor out of these specifications. They apply to the drum's inner surface after the drum has been machined on the lathe.

39. The amber ABS warning light on the instrument panel is illuminated. The fault code indicates a problem with the RR wheel speed sensor circuit. The technician should inspect:

  • A. The RR wheel speed sensor.
  • B. The RR wheel speed sensor's reluctor ring.
  • C. The RR wheel speed sensor's circuit.
  • D. All of the above.


Answer A is wrong. They create AC voltage signals that increase with wheel speed. Use a multimeter to troubleshoot an open (OL) or short (0.00) in the sensor.

Answer B is wrong. The reluctor wheel can become damaged or caked with dirt or clay.

Answer C is wrong. PM sensors produce an AC signal that is converted to DC by the control module.

Answer D is correct. If a code indicates a problem with a wheel speed sensor's circuit, inspect the circuit, the sensor's plug, and tip for damage, and the sensor's reluctor/tone ring for damaged teeth.

40. 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


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

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

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.