Question 1

Technician A says that the tinnerman nuts used to hold the brake drum on should be reinstalled when the drum is replaced. Technician B says that a drum should be removed inside a sealed vacuum enclosure or washed with water or solvent to prevent possible asbestos dust from being released into the air. Which technician is correct?

Accepted Answer

Technician B is correct because removing brake drums can release asbestos dust, which is hazardous. Using a sealed vacuum or washing the drum helps prevent this. Tinnerman nuts are not necessary for drum replacement.

Question 2

The backing plate should be replaced if the shoe contact areas (pads or ledges) are worn more than ________.

Accepted Answer

The backing plate should be replaced if the shoe contact areas are worn more than 1/16 in. (2 mm) to ensure proper brake function and safety.

Question 3

Technician A says that silicone grease can be used to lubricate the shoe contact ledges. Technician B says that synthetic brake grease, lithium brake grease, or anti-seize compound can be used as a brake lubricant. Which technician is correct?

Accepted Answer

Silicone grease is indeed suitable for lubricating shoe contact ledges because it is resistant to high temperatures and does not damage rubber components. Synthetic brake grease, lithium brake grease, or anti-seize compounds are also appropriate for use as brake lubricants due to their properties that withstand high temperatures and provide necessary lubrication without degrading brake system components.

Question 4

Most brake experts and vehicle manufacturers recommend replacing brake lining when the lining thickness is ________.

Accepted Answer

The answer of Most brake experts and vehicle manufacturers recommend...

Question 5

Technician A says that starwheel adjusters use different threads (left and right-handed) for the left and right sides of the vehicle. Technician B says that the threads and end caps of the adjusters should be lubricated with brake grease before being installed. Which technician is correct?

Accepted Answer

Starwheel adjusters typically use different threads for the left and right sides to ensure proper adjustment direction. Lubricating the threads and end caps with brake grease is recommended to ensure smooth operation and prevent corrosion.

Question 6

Technician A says that many vehicle manufacturers recommend that wheel cylinders not be honed because of the special surface finish inside the bore. Technician B says that some experts recommend that the wheel cylinders be replaced every time the brake linings are replaced. Which technician is correct?

Accepted Answer

Technician A is correct because many manufacturers advise against honing wheel cylinders due to the specific surface finish required. Technician B is also correct as some experts suggest replacing wheel cylinders with brake linings to ensure optimal brake performance and reliability.

Question 7

Most manufacturers recommend that brake parts should be cleaned with ________.

Accepted Answer

The answer of Most manufacturers recommend that brake parts should...

Question 8

Old brake shoes are often returned to the manufacturer when new friction material is installed. These old shoes are usually called the ________.

Accepted Answer

Old brake shoes returned to the manufacturer for new friction material installation are commonly referred to as the "Core." This term is used because the basic structure or "core" of the brake shoe is reused, while the worn-out friction material is replaced.

Question 9

After assembling a drum brake, it is discovered that the brake drum will not fit over the new brake shoes. Technician A says that the parking brake cable may not have been fully released. Technician B says to check to see if both shoes are contacting the anchor pin. Which technician is correct?

Accepted Answer

Both technicians provide valid reasons for the brake drum not fitting over the new brake shoes. Technician A points out that if the parking brake cable is not fully released, it could keep the shoes expanded, preventing the drum from fitting. Technician B suggests checking if both shoes are contacting the anchor pin properly, as improper contact could also prevent the drum from fitting.

Question 10

Technician A says to use masking tape temporarily over the lining material to help prevent getting grease on the lining. Technician B says that grease on the brake lining can cause the brakes to grab. Which technician is correct?

Accepted Answer

Both technicians are correct. Technician A's suggestion to use masking tape is a practical method to prevent grease contamination on the brake lining, which is important because, as Technician B states, grease on the brake lining can indeed cause the brakes to grab, affecting the vehicle's braking performance.

Question 11

Technician A says that brake drums should be labeled "left" and "right" before being removed from the vehicle so that they can be reinstalled to the same location. Technician B says that the holddown pins may have to be cut off to remove a worn brake drum. Which technician is correct?

Accepted Answer

Technician A is correct because labeling brake drums ensures they are reinstalled in the same position, which can help maintain balance and wear patterns. Technician B is also correct because sometimes holddown pins may need to be cut if they are seized or damaged, making drum removal difficult.

Question 12

Technician A says that most experts recommend replacing all drum brake hardware including the springs every time the brake linings are replaced. Technician B says that the starwheel adjuster must be cleaned and lubricated to assure proper operation. Which technician is correct?

Accepted Answer

Both technicians are correct. Technician A is correct because it is a common recommendation to replace all drum brake hardware, including springs, when replacing brake linings to ensure optimal brake performance and safety. Technician B is correct because the starwheel adjuster, which is part of the drum brake system, must be cleaned and lubricated to ensure it operates properly, allowing for proper brake adjustment.

Question 13

Technician A says that wheel cylinder dust boots keep dust and moisture out of the cylinder bore. Technician B says that it is normal for dust boots to allow a little seepage of fluid. Which technician is correct?

Accepted Answer

Technician A is correct because the primary function of wheel cylinder dust boots is to keep dust and moisture out of the cylinder bore, ensuring the braking system works efficiently. Technician B is incorrect; while some components in a vehicle might allow for minimal seepage, it is not normal for dust boots to allow fluid seepage as this indicates a potential leak or failure in the braking system.

Question 14

Technician A says that bolts are used to attach the wheel cylinder to the backing plate. Technician B says that clips are used to attach the wheel cylinder to the backing plate. Which technician is correct?

Accepted Answer

The answer of Technician A says that bolts are used...

Question 15

A starwheel adjuster is installed on the wrong side of the vehicle. Technician A says that the adjuster cannot operate at all if installed on the wrong side. Technician B says that the adjuster would cause the clearance to increase rather than decrease when activated. Which technician is correct?

Accepted Answer

Technician B is correct because if a starwheel adjuster is installed on the wrong side of the vehicle, it would indeed cause the clearance to increase rather than decrease when activated, due to the reverse threading and operation direction.

Question 16

Technician A says to use synthetic grease to lubricate the backing plate. Technician B says to use special lithium-based brake grease. Which technician is correct?

Accepted Answer

Both synthetic grease and special lithium-based brake grease are appropriate for lubricating parts of the brake system, such as the backing plate, as long as they are specified for high-temperature applications and compatibility with brake system components.

Question 17

Fixed drums are held on by a large spindle nut.

Accepted Answer

Fixed drums are typically secured to the vehicle's hub by a large spindle nut, which ensures the drum remains in place and operates correctly as part of the braking system.

Question 18

Today, most wheel cylinders are rebuilt, rather than replaced.

Accepted Answer

Most wheel cylinders are replaced rather than rebuilt due to the relatively low cost of new parts and the labor-intensive nature of rebuilding them. It is often more cost-effective and reliable to replace a faulty wheel cylinder with a new one.

Question 19

The first step in brake drum removal is to:

Accepted Answer

The answer of The first step in brake drum removal...

Question 20

When brake linings are replaced, the ________ should be inspected.

Accepted Answer

When brake linings are replaced, it is important to inspect the condition of the wheel cylinders to ensure they are not leaking and are functioning properly. The camber angle of the suspension is not directly related to the replacement of brake linings.

Quiz 100: Drum Brake Diagnosis and Service