Technician A says the size of the pads, shoes, drums, and rotors is based on the weight of the vehicle. Technician B says their size is based on the top speed the vehicle can achieve. Who is correct? a. A only b. B only c. both A and B d. neither A nor B
Technician A says the size of the pads, shoes, drums, and rotors is based on the weight of the vehicle. Technician B says their size is based on the top speed the vehicle can achieve. Who is correct?
a. A only
b. B only
c. both A and B
d. neither A nor B
If a force of 150 pounds is applied to a master cylinder with a piston area of 1 square inch, how much force is developed on a wheel cylinder that has a piston area of 2 square inches?
a. 75 pounds
b. 150 pounds
c. 300 pounds
d. 450 pounds
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
Brake fluid serves as a lubricant for the parts of the hydraulic system and ensures smooth and even operation.
a. True
b. False
Rusted-through brake lines are uncommon.
a. True
b. False
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. water in the brake fluid
b. petroleum-based lubricants in the fluid
c. fluid overheating
d. incorrect type of brake fluid
The upward movement of the rear suspension opens the ______.
a. residual pressure check valve
b. metering valve
c. height-sensing proportioning valve
d. pressure differential valve
A center high-mounted stop lamp (CHMSL) has been standard for more than 30 years.
a. True
b. False
The purpose of the master cylinder is to ______.
a. generate the hydraulic pressure needed to apply the brake
b. automatically pump the brakes during panic stops
c. supply mechanical force to the brake mechanisms
d. All the answers are correct.
The purpose of a pressure differential valve is being discussed. Technician A says it alerts the driver if pressure is lost in either portion of a dual braking system. Technician B says it provides the needed pressure balance between the front and rear brakes. Who is correct?
a. A only
b. B only
c. both A and B
d. neither A nor B
In a diagonal split brake system, how would the vehicle brake in the event of a failure?
a. One front wheel and its rear wheel will brake.
b. One front wheel and the opposite rear wheel will brake.
c. Only the front wheels will brake.
d. All four wheels will have half the total braking force.
Asbestos has not been used in brake linings or pads since 2003.
a. True
b. False
Technician A says low-drag calipers retract the pistons and pads farther from the rotor than traditional calipers. Technician B says systems that use low-drag calipers cannot use quick take-up master cylinders. Who is correct?
a. A only
b. B only
c. both A and B
d. neither A nor B
A brake line must be single-flared to provide a good seal at a joint or junction block.
a. True
b. False
Vehicles use brake pedal position sensors.
a. True
b. False
Technician A says power brakes are designed with vacuum-assisted units that use engine vacuum. Technician B says power brakes are designed with vacuum-assisted units that use vacuum developed by an external pump. Who is correct?
a. A only
b. B only
c. both A and B
d. neither A nor B
Synthetic linings are made of _____
a. fiberglass
b. aramid fiber
c. both A and B
d. neither A nor B
All manufacturers recommend a specific sequence to follow when bleeding a vehicle’s brakes.
a. True
b. False
Organic friction material _____ semimetallic materials.
a. is quieter than
b. is more fade resistant than
c. requires higher pedal pressure than
d. wears out faster than
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. internally leaking master cylinder
b. internally leaking caliper
c. leaking wheel cylinder
d. frozen pressure differential valve
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
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
What is the function of the line printed along the length of a brake hose?
a. It indicates that the hose has a neoprene liner.
b. It ensures that the hose is orientated outward, toward the wheel.
c. It indicates whether the hose is twisted.
d. It indicates that the hose is mounted on the left side.
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