Question 1

Technician A says racing calipers may be made of cast aluminum because it allows for weight decrease. Technician B says aluminum does not dissipate heat as well as steel or other heavier metals. Who is correct?

Accepted Answer

B

Question 2

The item indicated by the letter A is used to: ​

Accepted Answer

The item indicated by the letter A is typically the brake pad wear sensor or brake wear indicator. Its purpose is to indicate pad wear and alert the driver when it's time to replace the brake pads.

Question 3

Technician A says some rear disc brakes have a small parking brake drum built into the center of the rotor. Technician B says some rear disc brakes move the caliper piston to apply the parking brake. Who is correct?

Accepted Answer

Both technicians are correct. Some rear disc brake systems have an integrated drum parking brake built into the center of the rotor, while others use a separate mechanism that moves the caliper piston to apply the parking brake.

Question 4

Technician A says brake pads are position in the caliper on the sides of the rotor. Technician B says it is possible to identify the friction material of a new brake pad by observing a printed code on the edge of the pad or shoe. Who is correct?

Accepted Answer

Technician A is correct that brake pads are positioned on the sides of the rotor in the caliper. 
Technician B is also correct that it is possible to identify the friction material of a new brake pad by observing a printed code on the edge of the pad or shoe. Different codes correspond to different friction materials, which have varying performance characteristics.

Question 5

Technician A says the rotor hub contains the wheel bearing assembly. Technician B says the bearings on the nondriving wheels of many vehicles are tapered roller type bearings. Who is correct?

Accepted Answer

Both statements are correct. The rotor hub often contains the wheel bearing assembly, and it is common for the bearings on the nondriving wheels of many vehicles to be tapered roller type bearings.

Question 6

Technician A says that regardless of wear pattern, all of the pads on an axle should be replaced at the same time to prevent uneven braking and wear. Technician B says many manufacturers are now supplying brake pads of ceramic materials as the pad of choice. Who is correct?

Accepted Answer

Technician A is correct because replacing only some pads on an axle can lead to uneven braking and wear. Technician B is also correct because many manufacturers are indeed switching to ceramic brake pads for their superior durability and lower dust production. Therefore, both technicians are correct.

Question 7

All of the following statements about disc brake pad replacement are true EXCEPT:

Accepted Answer

Reversing pads to equalize wear is not recommended as that can cause uneven wear and reduced braking performance. It is better to replace both pads as a set.

Question 8

Technician A says grabbing brakes may be caused by worn rotors or pads. Technician B says pedal pulsation when the brakes are applied is caused by grease or brake fluid contamination of the pads. Who is correct?

Accepted Answer

The answer of Technician A says grabbing brakes may be...

Question 9

Technician A says the fixed caliper brakes are the  oldest type of disc brake. Technician B says the floating caliper allows the rotor to float between the pads as the brakes are being applied. Who is correct?

Accepted Answer

The answer of Technician A says the fixed caliper brakes...

Question 10

Technician A says the procedure-indicated illustration is a method of seating new pads. Technician B says the procedure shown is a method of retracting the caliper piston. Who is correct? ​

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Accepted Answer

The procedure shown is a method of retracting the caliper piston, which is done so that new brake pads can be installed. Technician A's statement is incorrect because the illustration shows the process of retracting the caliper piston, not seating new pads. Therefore, only Technician B is correct.

Question 11

Technician A says on some vehicles the disc brake pads can be visually inspected without removing the calipers. Technician B says on some vehicles disc brake pad thickness can be measured without removing the calipers. Who is correct?

Accepted Answer

Both technicians are correct. Some vehicles have a small inspection window on the caliper that allows for visual inspection of the brake pads without removing the caliper, and some have a measuring tool that can be inserted between the pads to measure the pad thickness without removing the caliper.

Question 12

Sliding calipers are being discussed. Technician A says the pads and pistons move when the brakes are applied. Technician B says the caliper stays stationary as the brakes are released. Who is correct?

Accepted Answer

Technician A is correct. Sliding calipers have pads and pistons that move when the brakes are applied, allowing the pads to clamp down on the rotor and slow the vehicle. Technician B is incorrect as the caliper itself also moves during the braking process.

Question 13

Technician A says the rotor converts kinetic friction into static friction for stopping the vehicle. Technician B says the caliper assembly straddles the outside diameter of the rotor. Who is correct?

Accepted Answer

Technician B is correct. The caliper assembly straddles the outside diameter of the rotor, while technician A's statement is incorrect as the rotor converts kinetic energy into heat energy to stop the vehicle.

Question 14

The tool shown in the illustration is used to: ​

Accepted Answer

The tool shown in the illustration is a caliper piston retractor tool. It is used to retract the rear caliper piston.

Question 15

Technician A says that during braking, pressure is exerted unequally against the bottom of the piston and the bottom of the cylinder bore. Technician B says the pressure to the piston is transmitted to the inboard brake pad to force the lining against the inboard rotor surface. Who is correct?

Accepted Answer

Technician B is correct because the pressure applied to the piston in a brake caliper is transmitted to the inboard brake pad, forcing it against the rotor surface. Technician A is incorrect as the pressure is exerted equally.

Question 16

Technician A says the seal around the piston is used to seal the hydraulic pressure behind the piston. Technician B says the seal around the piston is used to retract the piston. Who is correct?

Accepted Answer

The answer of Technician A says the seal around the...

Question 17

Technician A says it is not necessary to disconnect the brake hose from the caliper if the caliper is not being removed from the vehicle. Technician B says on some vehicles the brake pads can be removed from the caliper without removing the caliper from the vehicle. Who is correct?

Accepted Answer

Technician A is correct because if the caliper is not being removed from the vehicle, there is no need to disconnect the brake hose.

Technician B is also correct because on some vehicles, the brake pads can be removed from the caliper without removing the caliper from the vehicle. This is common on vehicles with sliding calipers or those with access holes in the caliper.

Question 18

Disc brake caliper internal components should be cleaned in:

Accepted Answer

Denatured alcohol is safe for cleaning disc brake caliper internal components because it effectively removes grease and oil without damaging rubber seals or other parts.

Question 19

New caliper piston seals should be lubricated with:

Accepted Answer

Lubricating new caliper piston seals with clean brake fluid is the correct practice because it is compatible with the brake system and will not degrade the seals. Silicone grease and petroleum jelly can degrade the rubber seals and are not recommended for use within the brake system.

Question 20

If the brakes require more pedal effort when stopping and the booster is okay, the problem may be caused by:

Accepted Answer

A sluggish or sticking caliper piston will require more pedal effort to stop the vehicle because it is not applying enough pressure to the brake pads. If the caliper piston is loose, it can cause brake fluid leaks and loss of braking power, but it would not necessarily require more pedal effort to stop.

Quiz 7: Disc Brakes