Brakes Final study guide
What color is clean brake fluid? a. brown b. clear or amber c. red d. dark blue
b. clear or amber
Brake rotors should be checked for _____. a. thickness b. parallelism c. runout d. All the answers are correct.
d. All the answers are correct.
Both non-servo drum brake leading and training shoes are self-energizing as the brakes are applied and the vehicle is moving forward. True or False
False
Drum brakes are still used on the front wheels of many late model cars and light trucks. True or False
False
On duo-servo designs, the rear shoe is the primary, and the front shoe is the secondary. True or False
False
Power brakes are completely different than a standard hydraulic brake system, using different types of master cylinders, calipers, and hydraulic circuits. True or False
False
Pumping the brake pedal quickly during ABS activation will assist the antilock brake system to function properly. True or False
False
Small lightweight cars often use duo-servo drum brake designs to reduce brake lockup. True or False
False
The self-adjusters (star wheels) for the left side and the right side are interchangeable. True or False
False
ABS pressure modulation works to prevent wheel locking. True or False
True
All brake fluids are hygroscopic—that is, they readily absorb water. True or False
True
All manufacturers recommend a specific sequence to follow when bleeding a vehicle's brakes. True or False
True
Brake fluid serves as a lubricant for the parts of the hydraulic system and ensures smooth and even operation. True or False
True
Brake service on an ABS-controlled vehicle is similar to that of a non-ABS-equipped vehicle. True or False
True
Disc brakes require more force than drum brakes to achieve the same braking effort. True or False
True
Electrical sensors on some vehicles advise the driver when the brake pads have worn thin and need to be replaced. True or False
True
Hydraulic system parts should never have contact with oil or grease. True or False
True
Master cylinders are generally not overhauled; they are replaced with new or rebuilt master cylinders. True or False
True
Riveted linings allow for better heat transfer than bonded linings. True or False
True
Stepping on the brake pedal while a brake drum is off can cause the pistons in the wheel cylinder to overextend or pop apart. True or False
True
The inability of drums to dissipate as much heat as disc brakes is one of the main reasons discs have replaced drums at the front of all late model cars and light trucks True or False
True
Unnecessary hard braking during the first 200 miles (320 km) of a brake pad's life can glaze the pads. True or False
True
Technician A replaces the pads if the linings are less than 1/8 inch (3.175 mm). Technician B says if the pad on one side of the caliper is worn more than the other side, the rotor has excess runout and must be replaced. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
a. A only
Technician A says a metering valve delays front braking until the rear brakes are applied. Technician B says a proportioning valve controls rear brake pressure, especially during moderate stops. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
a. A only
Technician A says self-adjustment occurs on most duo-servo brakes whenever the foot brake is applied while backing up. Technician B says self-adjustment occurs on a non-servo brake whenever the foot brake is applied when driving forward. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
a. A only
Technician A says that worn pad linings can cause rotor wear. Technician B says that hard spots in a rotor usually result from a manufacturing defect. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
a. A only
The customer complains of a high-pitched squeal whenever the wheels are turning, except when the brakes are applied. Technician A says the pads are worn and need replacement. Technician B says the rotors are scored and must be replaced. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
a. A only
The power brakes in a vehicle are grabbing. Technician A checks for grease or oil on the brake shoe and pad linings. Technician B checks the fluid level in the master cylinder. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
a. A only
While discussing brake fluids, Technician A says hygroscopic brake fluid absorbs moisture from the air. Technician B says DOT 3 brake fluid has a higher boiling point than DOT 4 fluid. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
a. A only
While road testing a car equipped with an antilock brake system, Technician A says during heavy braking, several pulses may be felt through the brake pedal. Technician B says a spongy pedal during normal braking is acceptable. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
a. A only
The purpose of the master cylinder is to ______. a. generate the hydraulic pressure needed to apply the brake mechanisms b. automatically pump the brakes during panic stops c. supply mechanical force to the brake mechanisms d. All the answers are correct.
a. generate the hydraulic pressure needed to apply the brake mechanisms
A technician is diagnosing a vehicle with a braking system problem. When she removes the filler cap to check the fluid level in the master cylinder, she notices that the rubber seal on the cap is swollen and has begun to disintegrate. What could be the problem? a. petroleum-based lubricants in the fluid b. incorrect type of brake fluid c. water in the brake fluid d. fluid overheating
a. petroleum-based lubricants in the fluid
A brake inspection reveals that the outboard pad is significantly thinner than the inboard pad. Technician A says the problem could be a defective dust boot that caused the caliper to seize. Technician B says the problem could be caused by poor lubrication or deformation of the machined sliding areas on the caliper and/or anchor plate. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
b. B only
A technician is diagnosing a car that had both front brake hoses replaced 5,000 miles ago. An inspection reveals that the right front brake hose has ruptured. Technician A says the specifications called for DOT 3 fluid; using DOT 4 fluid caused the failure. Technician B says the brake hose was twisted and stressed too much when installed. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
b. B only
A vehicle has a frozen caliper on the left front wheel. The right front caliper is in good condition. Technician A installs a set of four new pads and a remanufactured caliper on the left side. Technician B installs loaded calipers on the left and right side. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
b. B only
After new pads are installed, Technician A breaks in the new pads by making a half dozen or more hard stops from high speed to check whether the brakes will fade when hot. Technician B breaks in the new pads with several gentle to moderate stops, allowing time for the pads and rotors to cool between stops. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
b. B only
Servicing a brake drum with hard spots that are causing chatter and brake pull is being discussed. Technician A says he can grind off the hard spots. Technician B says the drum must be replaced. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
b. B only
Technician A removes brake dust from the brake assembly with compressed air. Technician B uses an OSHA-approved brake washer to clean drum brake assemblies. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
b. B only
Technician A says silicone-based brake fluid should always be used on ABS brake systems. Technician B says DOT 3 is the recommended fluid for most ABS systems. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
b. B only
The red brake warning light does NOT turn on when ______. a. the fluid level in the master cylinder is low b. a fault in the ABS system is detected c. there is a difference in pressure between brake circuits d. the parking brake is set
b. a fault in the ABS system is detected
In a typical drum brake, which component provides a foundation for the brake shoes and associated hardware? a. drum b. backing plate c. wheel cylinder d. lining
b. backing plate
As brake fluid absorbs moisture, _____. a. it becomes acidic b. its boiling point drops c. it becomes alkaline d. it oxidizes
b. its boiling point drops
The brake light (stop light) switch is located _____ on modern vehicles. a. on the master cylinder b. on a bracket above the brake pedal c. on the combination valve d. All the answers are correct.
b. on a bracket above the brake pedal
What could most likely lead to brake hose failure? a. incorrect brake fluid b. stressing the hose during installation c. extreme cold operation d. All the answers are correct.
b. stressing the hose during installation
Large vehicles typically use ______ rotors. a. solid b. ventilated c. two-piece d. All the answers are correct.
b. ventilated
Since _____, all cars have been required to have two separate brake systems. a. 1957 b. 1977 c. 1967 d. 1987
c. 1967
Which of the following could cause an extremely hard brake pedal? a. use of the wrong fluid b. excessively worn brake pads c. a leaking diaphragm in the vacuum power booster d. air in the system
c. a leaking diaphragm in the vacuum power booster
Linings are ____ to disc brake pads. a. riveted b. bonded c. both A and B d. neither A nor B
c. both A and B
Technician A bleeds the brakes system manually with the help of an assistant. Technician B uses a pressure bleeder. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
c. both A and B
Technician A says brake linings are riveted to the brake shoes. Technician B says brake linings are bonded to the brake shoes. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
c. both A and B
Technician A says when the Brake warning light is illuminated, there is a difference in pressure between the two brake hydraulic circuits. Technician B says the Brake warning light is illuminated when the fluid level in the master cylinder reservoir is low. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
c. both A and B
Technician A says when the ignition switch is turned to the start position, both the red and amber brake warning lights should turn on. Technician B says after the engine starts, the amber ABS warning light should turn off after three to five seconds if the system passes its self-test. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
c. both A and B
Technician A siphons out about two-thirds of the brake fluid from the master cylinder reservoir before beginning work on the pads or calipers. Technician B opens the caliper bleeder screws and runs a hose to a container to catch the fluid that is expelled. while pushing the pistons back. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
c. both A and B
Technician A uses a C-clamp to push the piston back into its bore when replacing pads. Technician B supports the caliper using safety wire while servicing the brakes. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
c. both A and B
While discussing quick take-up master cylinders, Technician A says this design is used with low-drag caliper pistons. Technician B says this design is only used on disc brake systems. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
c. both A and B
Dissipation of heat from the brake components is necessary to prevent brake ______. a. chatter b. grab c. fade d. shudder
c. fade
What type of power-assist unit uses pressure developed by an external pump, such as a power steering pump? a. ABS b. ASC c. hydraulic-assist d. vacuum-assist
c. hydraulic-assist
A technician is checking a car with an owner's complaint of poor braking performance and a low brake pedal. The master cylinder is full, and there are no signs of fluid leaks in the brake system. When he holds firm pressure on the brake pedal, the pedal slowly drops. What could be the problem? a. frozen pressure differential valve b. internally leaking caliper c. internally leaking master cylinder d. leaking wheel cylinder
c. internally leaking master cylinder
When the ABS is activated as a wheel begins to lock, the brake pedal will ______. a. drop about one inch b. go from hard to spongy c. make the driver feel a small bump followed by rapid pedal pulsations d. All the answers are correct
c. make the driver feel a small bump followed by rapid pedal pulsations
In the unapplied position, drum brake shoes are held against the anchor pin by the ______. a. star wheel adjuster b. shoe holddown c. return springs d. holddown springs
c. return springs
A grinding noise when the brakes are applied could be caused by ______. a. weak return springs b. weak holddown springs c. worn shoes d. All the answers are correct.
c. worn shoes
A fixed caliper _____. a. is bolted to the steering knuckle b. has pistons on both sides of the rotor c. does not move when the brakes are applied d. All the answers are correct.
d. All the answers are correct.
Brake linings should be replaced when linings are ______. a. worn to within 1/32 inch (.794 mm) of a rivet head b. contaminated with oil or grease c. contaminated with brake fluid d. All the answers are correct.
d. All the answers are correct.
In addition to wheel speed sensors, ESC systems also require a _____. a. steering angle sensor b. lateral-acceleration sensor c. yaw sensor d. All the answers are correct.
d. All the answers are correct.
Wheel cylinders should be rebuilt or replaced if _____. a. substantial amounts of brake fluid are found inside the boots b. wheel cylinder pistons are binding in their bores c. the brake has been contaminated with petroleum-based lubricants d. All the answers are correct.
d. All the answers are correct.
In a diagonal split brake system, how would the vehicle brake in the event of a failure? a. Only the front wheels will brake. b. One front wheel and its rear wheel will brake. c. All four wheels will have half the total braking force. d. One front wheel and the opposite rear wheel will brake.
d. One front wheel and the opposite rear wheel will brake.
The amber ABS brake warning light is illuminated with the engine running. The most likely cause of this problem is _____. a. a restricted brake hose b. a leak at the wheel caliper c. excessive pedal free play d. a faulty wheel speed sensor
d. a faulty wheel speed sensor
Solid rotors are usually found on _____. a. the front brakes of small, compact vehicles b. the rear brakes of vehicles with rear disc brakes c. the front brakes of large pickup trucks and SUVs d. both A and B
d. both A and B
A metering valve is found only on cars and trucks with ______. a. dual diagonal brake circuits b. four wheel disc brakes c. four wheel drum brakes d. disc front and drum rear brakes
d. disc front and drum rear brakes
While manually bleeding a brake system, Technician A loosens all the brake bleeder screws at the same time. Technician B uses shop air to push the fluid and air through the lines and out the bleeder screws. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
d. neither A nor B
A proportioning valve reduces fluid pressure to ______. a. the front brakes during hard braking b. the front brakes during initial brake (low pedal force) application c. the rear brakes during initial (low pedal force) brake application d. the rear brakes during hard braking
d. the rear brakes during hard braking
