Question 1

Which of the following statements concerning ceramic rotors is NOT true?

Accepted Answer

Ceramic rotors are known for their durability and longevity compared to cast iron rotors, so they do not wear out much faster.

Question 2

Technician A says the caliper piston seal prevents leakage of brake fluid between the cylinder bore and the piston. Technician B says the caliper piston seal does not contribute to the piston's automatic adjustment feature. Who is correct?

Accepted Answer

Technician A is correct. The caliper piston seal is responsible for preventing leakage of brake fluid between the cylinder bore and the piston. Technician B is incorrect. The piston's automatic adjustment feature is typically achieved through the use of a self-adjusting mechanism or by the movement of the brake pads against the rotor. The caliper piston seal does not play a role in this automatic adjustment.

Question 3

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?

Accepted Answer

Technician A is correct because worn pad linings can cause rotor wear. As the brake pads wear down, they become thinner and the metal backing of the pad can come into contact with the rotor, causing it to wear down as well.

Technician B is incorrect because hard spots in a rotor can also be caused by other factors, such as overheating, uneven cooling, or uneven wear caused by uneven brake pad pressure distribution. While manufacturing defects may be one possible cause of hard spots, it is not the only one.

Question 4

Composite rotors are made of cast iron and ______.

Accepted Answer

The answer of Composite rotors are made of cast iron...

Question 5

Technician A cleans brake components in denatured alcohol. Technician B cleans brake components in clean brake fluid. Who is correct?

Accepted Answer

Both technicians A and B are correct. Denatured alcohol and clean brake fluid are both suitable for cleaning brake components. It is important to ensure that the cleaning solution is compatible with the type of brake components being cleaned and that any residue from the cleaning solution is completely removed before reassembly.

Question 6

Large vehicles typically use ______ rotors.

Accepted Answer

Large vehicles typically use ventilated rotors because they provide better heat dissipation, which is crucial for handling the increased braking demands of heavier vehicles.

Question 7

Technician A says some caliper designs use only one pad lining per brake assembly. Technician B says some disc brake pads have wear sensors. Who is correct?

Accepted Answer

The answer of Technician A says some caliper designs use...

Question 8

Technician A says a ventilated rotor helps cool the disc brake assembly. Technician B says the splash shield helps cool the disc brake assembly. Who is correct?

Accepted Answer

Both technicians are correct. A ventilated rotor has gaps between the brake discs, allowing air to flow through and cool the disc brake assembly. The splash shield also helps to direct air towards the disc brake assembly for additional cooling.

Question 9

Disc brake caliper pistons are being removed. Technician A positions a large dull screwdriver in the piston's dust boot groove to pry out the piston. Technician B injects 25 psi (172 kPa) of air pressure into the fluid line connection bore to remove the caliper piston. Who is correct?

Accepted Answer

Injecting air pressure into the fluid line connection bore is the correct method for removing disc brake caliper pistons. Using a screwdriver to pry out the piston can damage the piston or the caliper, and is not the recommended method.

Question 10

Linings are ____ to disc brake pads.

Accepted Answer

Linings can be attached to disc brake pads using either rivets or adhesive bonding methods.

Question 11

What prevents moisture from entering the cylinder bore?

Accepted Answer

The dust boot is designed to prevent moisture, dust, and other contaminants from entering the cylinder bore, ensuring the piston can move smoothly without interference or damage.

Question 12

Technician A says a fixed rotor has an integral hub inside which the wheel bearings are mounted. Technician B says a floating rotor is less expensive than a fixed rotor and can be replaced easily and economically. Who is correct?

Accepted Answer

Technician A is correct because a fixed rotor does indeed have an integral hub where the wheel bearings are mounted, making it a single unit. Technician B is also correct because a floating rotor, which is not integrated with the hub, tends to be less expensive and easier to replace than a fixed rotor.

Question 13

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?

Accepted Answer

The answer of Technician A replaces the pads if the...

Question 14

The ball-and-ramp-type parking brake actuator is found on what make of vehicles?

Accepted Answer

The answer of The ball-and-ramp-type parking brake actuator is found...

Question 15

Caliper housings are made from ______.

Accepted Answer

Caliper housings are commonly made from both aluminum and cast iron, as these materials provide the necessary strength and heat resistance required for braking systems.

Question 16

Rotors are typically made from ______.

Accepted Answer

The answer of Rotors are typically made from ______.
...

Question 17

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?

Accepted Answer

Both technicians are correct. Technician A is removing some of the brake fluid to prevent it from overflowing during the process of pushing the caliper pistons back in. Technician B is correct in opening the bleeder screws and catching the fluid expelled while pushing back the pistons to prevent air from getting into the brake lines. By doing this, the old brake fluid is replaced with new, fresh fluid.

Question 18

Which of the following is NOT associated with a pedal pulsation problem?

Accepted Answer

The answer of Which of the following is NOT associated...

Question 19

Technician A uses a minimum of 50 psi (345 kPa) of air pressure to force the piston from the caliper housing. Technician B heats the caliper housing with an oxyacetylene torch to boil the fluid and pop the piston out of the housing. Who is correct?

Accepted Answer

The answer of Technician A uses a minimum of 50...

Question 20

Disc brake rotor conditions are being discussed. Technician A resurfaces the rotor if it has lateral runout, lacks parallelism, or is scored. Technician B resurfaces both the left and right rotors even if only one rotor has problems. Who is correct?

Accepted Answer

Both technicians are correct. Technician A resurfaces the rotor for valid reasons such as lateral runout, lack of parallelism, or scoring, which are common issues that can affect braking performance. Technician B follows a best practice by resurfacing both rotors on the same axle to ensure they are uniform in thickness and surface condition, which helps maintain balanced braking and prevent future problems.

Quiz 52: Disc Brakes