ASE A5 Test Prep - Brakes - Questions, Answers and Explanations After applying the brake pedal several times to deplete the fluid reserve in the
... [Show More] accumulator of a Hydro-Boost system, a technician applies the brake pedal with moderate pressure and starts the engine. What should the technician feel at the pedal if the Hydro-Boost system is operating properly? A. The pedal should initially rise before moving downward. B. The pedal should initially move downward before rising up. C. The pedal should move downward. D. The pedal should rise. If the Hydro-Boost system is operating properly, the brake pedal should initially move downward before rising up against foot pressure. All of the following can cause disc brake squeal EXCEPT: A. loose or missing anti-rattle springs B. Grease on the linings C. Glazed linings D. Dirt embedded in the linings Brake linings that are contaminated with grease, oil, or brake fluid can cause the vehicle to pull when the brakes are applied, but would not cause the brakes to squeal. Technician A says that when rebuilding a caliper with a stroking seal, the condition of the caliper bore surface is critical. Technician B says that when rebuilding a caliper with a fixed seal, the condition of the piston surface is most important consideration. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B Both technicians are right. A stroking seal is located in a groove in the caliper piston and moved with the piston. The lip of the seal rides against the surface of the caliper bore, so the caliper bore must be smooth to prevent leaks. A fixed seal is installed in a groove in the caliper bore. It seals against the outside surface of the caliper piston, so that surface must be in good condition to provide a good seal. All of the following can cause a vehicle to pull to one side when the brakes are applied EXCEPT: A. Seized caliper piston B. Worn strut rod bushings C. Blocked master cylinder compensating port D. Brake fluid soaked linings A blocked master cylinder compensating port could cause all brakes to drag but would not cause a brake pull. All of the other choices could cause brake pull. Technician A says that ABS wheel speed sensor gap should be adjusted with a non-magnetic feeler gauge. Technician B says that a paper spacer can be used to adjust abs wheel speed sensor gap but the paper must be removed before the vehicle is operated. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B New wheel speed sensors come with the paper spacer installed but it is not necessary to remove it; the spacer is designed to wear off during vehicle operation. When discussing wheel bearings, all of the following statements are true EXCEPT: A. Tapered wheel bearings are most commonly used on drive axles B. Sealed ball bearings are not adjustable. C. A new grease seal should be installed when bearings are repacked D. The races on tapered wheel bearings cannot be interchanged Tapered roller bearings are usually used in non-drive axles. All of the other statements are true. All of the following could cause the parking brake to not hold a vehicle on a grade EXCEPT: A. Seized cables B. Excessive rear brake shoe-to-drum clearance C. Seized wheel cylinder D. Broken parking brake linkage The parking brake system engages the rear brakes mechanically; a seized wheel cylinder would not affect parking brake operation. To determine the serviceability of a brake drum, all of the following should be checked EXCEPT: A. diameter B. minimum thickness C. out-of-roundness D. tape wear Minimum thickness is checked when inspecting a disc brake rotor. All of the other measurements mentioned should be made when inspecting a brake drum. A vehicle's brake pedal is pumped rapidly 20 times and then held down. The master cylinder cover is then removed and when the pedal is released, a geyser is seen coming from the reservoir. Tech A says that this indicates that air is trapped in the system. Tech B says that this means that fluid is being forced out of the cylinder bore through the compensating ports and is normal master cylinder operation. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B Pumping the brakes compresses the air an d when the pedal is released, the compressed air pushes the hydraulic fluid back through the lines, causing it to squirt. Technician B is wrong because a small squirt of fluid should appear over the reservoir, indicating that fluid is being forced out of the cylinder bore through the compensating ports, only when the pedal is applied. Technician A says that RWAL ABS systems must be diagnosed using a scan tool. Technician B says that the abs arming light will only come on when there is a fault in the system. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B Neither technician is right. Technician A is wrong because, while most Rear Wheel Anti-Lock (RWAL) systems offer flash-code diagnostics, most four-wheel ABS systems require the use of a scan tool to extract stored fault codes from the computer's memory. Technician B is wrong because the 'anti-lock' warning light will come on whenever the key is turned ON, and if there are no faults in the system, will then go out after a few seconds. Technician A says that any imperfection found in a phenolic caliper piston warrants replacement. Technician B says that a phenolic caliper piston should be protected with a block of wood when installing it into the caliper bore with a C-clamp. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B A phenolic piston should be protected to keep it from being damaged when a C-clamp is used. Technician A is wrong because minor surface imperfections are OK provided they do not enter the dust boot groove area. Which of the following should be used to measure the thickness of a scored rotor? A. Vernier caliper B. Outside micrometer with flat anvil and spindle [Show Less]