ASE A5 Brakes Practice Test
31. A front-wheel-drive vehicle with four-wheel disc brakes pulls to the left after braking. Which of the following is MOST likely causing this pull?
- A. A frozen RR brake caliper.
- B. A kink in the LR brake line.
- C. A restriction in the RF brake line.
- D. A restriction in the LF brake line.
Answer A is wrong. A frozen caliper in the RR brake assembly result in noticeably uneven braking. Inspect the front brakes first.
Answer B is wrong. Replace damaged brake line with line approved by the vehicle's manufacturer (double-walled steel line), not copper.
Answer C is wrong. A restriction in the RF brake line causes a pull to the right after braking.
Answer D is correct. The master cylinder creates more than enough pressure to bypass the kink and apply the brake. The problem is the brake caliper or wheel cylinder is unable to create enough pressure to bypass the kink and return the fluid to the master cylinder. This residual pressure keeps the brake applied at that wheel resulting in brake drag.
32. 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 light?
- 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. When the electric sensor's tip contacts the rotor, the pad warning light illuminates on the instrument panel. Unfortunately, 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.
33. A passenger vehicle has a growling sound that increases in intensity while making left-hand turns. The MOST likely cause of this sound is:
- A. Excessive rotor lateral run out.
- B. A faulty LF wheel bearing.
- C. A worn CV-Joint.
- D. A faulty RF wheel bearing.
Answer A is wrong. Excessive lateral rotor run-out results in pulsation in the brake pedal (front) or the driver's seat (rear).
Answer B is wrong. A warped brake drum is similar to a warped rotor resulting in a pulsating brake pedal (front) or the driver's seat (rear).
Answer C is wrong. A worn CV- Joint makes a clicking noise while cornering.
Answer D is correct. The wheel bearing on the outside of the turn is louder because it has more vehicle weight leaning on it. While making a left-hand turn, a bad right front wheel bearing is louder.
34. 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.
35. The master cylinder reservoir cap gasket is swollen and deformed. The cap fits tight, and there are no external leaks found. Technician A says the brake fluid is contaminated. Technician B says brake fluid is hygroscopic and readily absorbs moisture from the air. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
Answer A is wrong. Petroleum products are particularly damaging to rubber brake components. Inspect the gasket for damage and the fluid for contamination. If the gasket's seal is missing or broken and the brake fluid is contaminated, a flush will be necessary.
Answer B is wrong. Brake fluid is hygroscopic and readily absorbs moisture from the air. The reservoir cap gasket functions as a flexible seal to prevent contamination of the brake fluid. Fluid would appear on the reservoir's body if the cap seal were leaking.
Answer C is correct. Most of today's vehicles have composite plastic reservoirs with a screw-on type cap. Reservoir caps have a rubber gasket between the cap and the reservoir.
Answer D is wrong. The gasket flexes inward and prevents air from entering the system as reservoir levels drop.