ASE A5 Brakes 80 CORRECTLY ANSWERED QUESTIONS LATEST UPDATE

ASE A5 - Brakes 80 CORRECTLY ANSWERED QUESTIONS LATEST UPDATE On a car with disc/drum brakes, the front brakes grab quickly when light pedal pressure is applied. This problem could be caused by a bad: A. Proportioning valve B. Pressure safety switch C. Metering valve D. Residual check valve The driver of a vehicle with power disc/drum brakes says that the brake pedal moved slowly to the floor while maintaining pedal pressure at a stoplight. What could cause this problem? A. Leaking primary piston cup in master cylinder B. Leaking power brake booster C. Leaking residual check valve in master cylinder D. Internal leak in the combination valve What is the purpose of the master cylinder residual check valve(s) on vehicles equipped with drum brakes? A. Allowed the driver to pump up the brakes B. Prevents air from entering the hydraulic system C. Prevents wheel lockup by reducing the hydraulic pressure D. Reduces pedal pulsation by controlling hydraulic pressure A technician has just overhauled the front brakes on a vehicle with front disc and rear drum brakes. However, when he attaches a pressure bleeder (pressurized to about 25 psi) to the master cylinder, he cannot get any fluid to come out of the disc brake caliper bleeder screws. Which of the following is MOST LIKELY the cause? A. Bad proportioning valve B. Bad pressure differential valve C. proportioning valve release button not activated D. Metering valve release button not activated On a vehicle with single piston floating caliper front disc brakes, the brake pads on the left side of the vehicle are almost completely worn while the right side is almost new. Tech A says that too much rotor runout could be the cause. Tech B says that a binding caliper piston could be the cause. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B A hydraulic brake line is leaking. Which of the following is the correct repair procedure? A. Cut out the bad section and replace with new steel tubing using compression fittings. B. Replace the leaking line with double-flared, seamless copper tubing. C. Cut out the bad section and replaced with single-flared steel tubing using flare nuts and unions. D. Replace the leaking line with double-flared steel tubing. Which of the following problems would be caused by using a residual check valve in a disc brake master cylinder? A. Reduced brake pedal travel B. Reduced brake system pressure C. Increased brake pad wear D. Increased rotor runout. A customer complains that their vehicle pulls to the right when the brakes are applied. Technician A says a restricted brake line to the left caliper can cause this problem. Technician B says a malfunctioning proportioning valve is probably the cause. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B With foot pressure applied, the brake pedal on a vehicle with vacuum assisted power brakes moves down slightly when the engine is started. Tech A says that this condition can be caused by a leaking power brake booster diaphragm. Tech B says that the cause could be a faulty power brake booster check valve. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B The hydraulic system on a vehicle with integral ABS is to be bled. Technician A says that the front brakes can be bled in a conventional manner. Technician B says that both front and rear brakes can only be bled using the pressure from a fully charged accumulator. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B A driver complains that the ABS system on his car engages every time he applies the brakes on a cobblestone roadway he uses going back-and-forth to work. This condition means that: A. The system is operating normally. B. The wheels are traveling at different speeds. C. A wheel speed sensor(s) is faulty. D. both A and B Two technicians are discussing the duo-servo type drum brake design. Technician A says that the brake lining on the secondary shoe is usually thicker than the brake lining on the primary shoe. Technician B says the primary shoe is installed toward the rear of the vehicle. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B All of the following statements about leading-trailing type drum brakes are true EXCEPT: A. The leading shoe does most of the forward braking. B. Both brake shoes are held against a fixed anchor on the back plating. C. They are self-energizing. D. The trailing shoe does most of the reverse braking. Technician A says that DOT 5 brake fluid had a lower boiling point than DOT 4. Technician B says that DOT 4 brake fluid is silicone-based and should never be used in an ABS system. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B Brakes that drag or fail to release can be caused by which of the following conditions in the master cylinder? A. leaking primary cup B. leaking secondary cup C. failure of the residual pressure check valve D. clogged compensating port All of the following could cause a hard brake pedal on a vehicle with power brakes EXCEPT: A. An engine with the valves adjusted too tight B. Brake fluid on the linings C. A leak in the brake hydraulic system D. A frozen caliper Technician A says that a caliper seal installed in the caliper bore is called a stroking seal. Technician B says that when the brake pedal is released, the piston in the caliperpves back in its bore due to the action of the piston seal. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B When replacing disco brake pads, you must bottom the caliper piston in its bore to create room for the new pads. Which of the following is proper procedure? A. Use a C-clamp or pliers to slowly bottom the piston in the caliper. B. Remove half the fluid from the master cylinder reservoir, then use a C-clamp or pliers to slowly bottom the piston in the caliper. C. Connect a hose to the caliper bleeder screw and insert the other end of the hose into a suitable container, open the bleeder screw, then use a C-clamp or pliers to slowly bottom the piston in the caliper. D. Remove the caliper from the vehicle, then use a C-clamp or pliers to slowly bottom the piston caliper. Technician A says that all 3-channel ABS systems use only 3 wheel speed sensors. Technician B says that a 4-channel ABS system means that fluid pressure is independently regulated to each of the wheels during an ABS stop. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B Technician A says that when a rotor is machined, an equal amount of material must always be removed from both sides. Technician B says that the minimum thickness dimension cast into the rotor is the dimension that the rotor can be machined to. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B The purpose of an anti-lock brake system is to maintain tire (wheel) slip at what level? A. A level between 50-75% B. 100% C. 0% D. A level between 10-20% While on a road test, a technician notices that the rear wheels lockup and the car skids when attempting to stop quickly from a high speed. The MOST LIKELY cause of this problem is a defective: A. residual pressure check valve B. pressure differential valve C. metering valve D. proportioning valve Excessive slack in the parking brake cables can be eliminated on most vehicles by making an adjustment at the : A. equalizer B. star wheel adjusters C. strut rod D. pushrod A customer complains that the brake warning light comes on whenever the brake pedal is depressed while driving. All of the following could cause the to occur EXCEPT: A. A leak in the rear half of the hydraulic system. B. A short to ground in the warning light circuit. C. A leak in the front half of the hydraulic circuit. D. A leaking pressure differential switch. The MOST common cause for premature front brake pad wear in disc/drum system is: A. Seized calipers B. Faulty master cylinder C. Improperly adjusted rear shoes D. Malfunctioning metering valve Technician A says that DTCs can be accessed from any ABS system using flash diagnostics. Technician B says that ABS system tests can be performed with a bi-directional scan tool. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B To determine if an intermittent ABS problem is related to an erratic wheel speed sensor signal, which of the following should be used? A. Ohmmeter B. Voltmeter C. Scan tool D. Digital storage oscilloscope A few minutes after the engine was turned off on a vehicle with vacuum power assist, the brake pedal is applied and it is hard to push. Technician A says that this is a normal condition. Technician B says that the booster check valve is leaking. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B During a brake inspection, an area of the vacuum brake booster below the master cylinder is found to be damp. Tech A says that this is a normal condition. Tech B says that any evidence of fluid indicates a leak and the master cylinder must be replaced. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B Technician A says that tapered roller bearings can be adjusted using a torque wrench. Technician B says that tapered roller bearings are adjusted using a dial indicator. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B