ASE Brakes 2023 Questions and Answers Graded A

Disc brakes use replaceable friction material called __________. - Pads Drum brakes use replaceable friction material called ________. - Shoes Technician A says that a power-assisted brake reduces stopping distances compared with a non-power-assisted brake system. Technician B says that the power-assisted brake system reduces the force that the driver must exert on the brake pedal. Which technician is correct? - Technician B only A locked wheel ___________________ to the road surface than a rolling wheel. - Has less traction Technician A says that all vehicles equipped with ABS will experience a pulsating brake pedal even during normal braking. Technician B says that some ABS units only control the rear wheel brakes. Which technician is correct? - Technician B only The FMVSS 135 standards determine ____________. - The Performance of the Braking system An owner of a vehicle equipped with ABS brakes complained that whenever he tried to stop on icy or slippery roads, the brake pedal would pulse up and down rapidly. Technician A says that this is normal for many ABS units. Technician B says that the ABS unit is malfunctioning. Which technician is correct? - Technician A only Electric adjustable pedals operate___. - Both the accelerator and the brake pedal What is NOT specified by the FMVSS 135? - Brake Noise Levels What is the purpose of any brake repair? - To restore like-new performance True or False: Kinetic energy of a vehicle doubles when the speed doubles. - True Technician A says that the front brakes do most of the braking because the front brakes are larger. Technician B says that due to weight transfer, most of the braking force needs to be supplied by the front brakes. Which technician is correct? - Technician B only The brake pedal assembly uses a mechanical lever to __________________ - Increase the driver's force on the brake pedal applied to the master cylinder.` The friction between two surfaces is NOT affected by ______________. - Speed difference between the two surfaces.` Technician A says that the thicker or heavier the disc brake rotor, the more heat can be absorbed. Technician B says that the faster the vehicle is traveling when the brakes are applied, the greater the amount of heat created in the brake system. Which technician is correct?` - Both Technicians A and B` What type is not a type of Brake Fade? - Rotor Fade Brake fade caused by water can occur __________________ - When driving through water puddles or during a severe rainstorm What can the driver do to reduce the possibility of brake fade caused by heat? - Select a lower transmission gear Maximum deceleration rates for a typical passenger car or light truck is __________. - 16 to 32 ft/sec2 Disc brake pads can reach temperatures as high as _____________. - 1,300ºF (700ºC) Two technicians are discussing master cylinders. Technician A says that it is normal to see fluid movement in the reservoir when the brake pedal is depressed. Technician B says a defective master cylinder can cause the brake pedal to slowly sink to the floor when depressed. Which technician is correct? - Both Technicians A and B The primary brake circuit fails due to a leak in the lines, leaving the rear section of a dual split master cylinder. Technician A says that the driver will notice a lower than normal brake pedal and some reduced braking power. Technician B says that the brake pedal will "grab" higher than normal. Which technician is correct? - Technician A only Two technicians are discussing a problem where the brake pedal travels too far before the vehicle starts to slow. Technician A says that the brakes may be out of adjustment. Technician B says that one circuit from the master cylinder may be leaking or defective. Which technician is correct? - Both Technicians A and B Air in the lines will cause what type of problem? - Low spongy brake pedal The master cylinder is able to move about how much brake fluid during each brake application? - One teaspoon Brake fluid pressure is measured in what unit? - PSI How much brake fluid is in a typical master cylinder reservoir? - Enough to allow all brakes to become completely worn What part in the master cylinder helps keep air from contacting the brake fluid yet allows the fluid level to drop as the disc brakes wear? - Rubber diaphragm or floating disc The brakes on a vehicle work okay for a while, then the vehicle slows because the brakes self-applied. Technician A says that an overfilled master cylinder could be the cause. Technician B says that a blocked vent port (compensating port) could be the cause. Which technician is correct? - Both Technicians A and B Technician A says a pull to the right during braking could be caused by a defective metering valve. Technician B says a pull to the left could be caused by a defective proportioning valve. Which technician is correct? - Neither Technician A nor B The rear brakes lock up during a regular brake application. Technician A says the metering valve could be the cause. Technician B says that stuck front disc brake calipers could be the cause. Which technician is correct? - Technician B only The rear wheels lock up during hard braking. Technician A says that a defective metering valve could be the cause. Technician B says that a defective proportioning valve could be the cause. Which technician is correct? - Technician B only A combination valve could include__________________. - Proportioning, metering, and pressure-differential valves A residual check valve is used to ______________. - Maintain a slight pressure on the hydraulic system Technician A says that the red brake warning light can be turned on if a difference in pressure is detected by the pressure-differential switch. Technician B says that the red brake warning light can be turned on if the brake fluid level sensor detected low brake fluid level. Which technician is correct? - Both Technicians A and B Which type of vehicles most often do not use metering valves? - Front-wheel drive Technician A says that some proportioning valves are one part and used to control both rear brakes. Technician B says that some proportioning valves are two parts, one for each rear wheel brake. Which technician is correct? - Both Technicians A and B The button on the _______________ valve should be held when pressure bleeding the brakes. - Metering A typical brake light is electrically _________________. - Normally open The type of brake fluid most often recommended by vehicle manufacturers is _______. -