ASE A5 Brakes Practice Test
31. After replacing all four rotors and pads on a disc brake system, a pulsation is still felt in the steering wheel when braking. Which of the following is MOST likely causing this vibration?
- A. A rusty hub flange.
- B. Sticking slide pins.
- C. Thickness variation.
- D. Lateral runout.
Answer A is correct. Rust and debris result in an uneven surface on the hub flange.
Answer B is wrong. Sticking slide pins cause uneven pad wear.
Answer C is wrong. Since it has four new rotors, it is likely something else, like the hub flange.
Answer D is wrong. Excessive lateral runout will cause a vibration in the steering wheel. The importance of inspecting components like the hub flange must be considered. Rust or debris on the flange results in a comeback with a pulsation that occurs when braking.
32. A vehicle with four-wheel disc brakes has a soft and spongy brake pedal. Which of the following is causing this spongy pedal?
- A. Air in the brake lines.
- B. Low manifold vacuum.
- C. The brake booster.
- D. Master cylinder cup seals.
Answer A is correct. Air bubbles in the brake lines result in a soft spongy pedal.
Answer B is wrong. A low manifold vacuum would deprive the vacuum assist unit of its vacuum source.
Answer C is wrong. A faulty vacuum booster produces a hard brake pedal.
Answer D is wrong. Leaking master cylinder cup seals cause the brake pedal to fade to the floor.
33. A vehicle with a front disc rear drum brake system nosedives while lightly braking. Which of the following is causing this condition?
- A. Worn brake pads.
- B. Over-adjusted brakes.
- C. The proportioning valve.
- D. The metering valve.
Answer A is wrong. Worn brake pads result in brake squeal.
Answer B is wrong. Over-adjusted brakes result in brake drag and worn rear brake shoes.
Answer C is wrong. The proportioning valve prevents rear wheel lockup.
Answer D is correct. A faulty metering valve results in a nosedive condition.
34. A vehicle has a grinding noise that gets louder and changes pitch while turning right. Which of the following is causing this noise?
- A. A cupped left front tire.
- B. A faulty left front wheel bearing.
- C. A grabbing left front brake.
- D. Worn left front strut.
Answer A is wrong. Cupped tires make a noise that changes pitch on different road surfaces.
Answer B is correct. Faulty wheel bearings make a grinding or growling noise that changes pitch during turns. For example, the left front wheel bearing is louder while turning right because more of the vehicle's weight leans on it during a right-hand turn.
Answer C is wrong. Left front brake drag causes the vehicle to pull to the left.
Answer D is wrong. Worn struts result in cupped tires.
35. A technician is replacing a brake hose and a damaged section of brake line tubing. Which of the following is correct?
- A. Repair damaged brake line with a compression fitting.
- B. Use double-wall steel tubing.
- C. Use single-wall copper tubing.
- D. Re-use the original brass washer when replacing a brake hose.
Answer A is wrong. Compression fittings can not safely withstand the high pressure of automotive brake systems.
Answer B is correct. Brake lines are made from double-walled steel tubing and coated with tin or an alloy capable of resisting rust and corrosion.
Answer C is wrong. Copper tubing (100% copper) cannot withstand the high pressure and vibrations that stainless steel double-walled steel tubing can.
Answer D is wrong. Never re-use the same soft brass washer when replacing a worn brake hose.