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Exam 8: Drum Brakes

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Question 21

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Technician A says leading-trailing shoe drum brakes may have cam-type adjusters. Technician B says leading-trailing shoe drum brakes may have starwheel adjusters. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

E) A) and B)
F) None of the above

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Question 22

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Define a servo brake system.

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Servo brakes are systems in wh...

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Question 23

True/False

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The primary brake shoe is sometimes called the trailing shoe.

What action is shown in the following illustration? ​

The brake shoe ____________________ is the metal part of the brake shoes to which linings are attached.

One-piece cast-iron drums are often seen on late-model vehicles.

The drum measurement shown below is being discussed. The drum has a discard diameter of 11.400 inch. Technician A says to replace the drum. Technician B says the drum can be turned 0.005 inch and reused. Who is correct?

Technician A says leading-trailing brakes are also called full-servo brakes. Technician B says duo-servo brakes are also called non-servo brakes. Who is correct?

How is a cracked drum serviced?

Every service drum brake assembly has two brake shoes.

Technician A says duo-serve brakes only self-adjust in reverse. Technician B says only leading-trailing brakes will self-adjust as necessary going in either direction. Who is correct?

Which of the following will most likely cause the vehicle to pull to one side?

The backing plate provides the mounting platform for the brake assembly and closes the rear of the mounted brake drum.

Technician A says an inspection of the braking system should include the wheel assemblies. Technician B says a brake inspection includes components of the steering and suspension systems. Who is correct?

How is the ratchet-type self- adjuster for leading-trailing brakes operated?

Technician A says the wheel cylinder springs are return springs. Technician B says the shoe return springs push the pistons back in place. Who is correct?

On a duo-servo brake adjuster, what actually engages the starwheel to cause it to turn?

Technician A says that in a self-energizing brake, the rotation of the drum decreases the braking force of the lining against the drum. Technician B says that the force of the brake drum is added to the force supplied by the wheel cylinder. Who is correct?

The starwheel adjusting screw threads should be lubricated with:

All of the following statements about brake drum measuring and condition are true EXCEPT: