Exam 100: Drum Brake Diagnosis and Service | Examlex

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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?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Correct Answer
verified

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

A) 0.030 in. (0.8 mm)
B) 0.050 in. (1.3 mm)
C) 0.040 in. (1.0 mm)
D) 0.060 in. (1.5 mm)

Correct Answer
verified

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?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Correct Answer
verified

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?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Correct Answer
verified

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?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Correct Answer
verified

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?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Correct Answer
verified

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?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Correct Answer
verified

Technician A says that the access hole for the starwheel adjuster may be in the brake drum web. Technician B says that the access hole for the starwheel may be found in the backing plate. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Correct Answer
verified

The first step in brake drum removal is to:

A) Loosen the parking brake cable
B) Remove the drum retaining device
C) Remove the master cylinder cover to bleed off hydraulic pressure
D) Mark the drum R or L

Correct Answer
verified

Wheel cylinders are being discussed. Technician A says that if a wheel cylinder is not leaking fluid it is OK. Technician B says that wheel cylinders require further inspection. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Correct Answer
verified

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