Exam 99: Drum Brakes

________ action uses drum rotation to force the brake shoe outward and wedge it tightly against the brake drum.

The greatest disadvantage of drum brakes is ________.

What term describes component "A" in this illustration?

Which lining does most of the braking on a dual-servo brake?

Holes may be provided in the backing plate for inspecting brake lining wear.

What term describes component "B" in this illustration?

Automatic adjusters may be actuated by all of the following EXCEPT ________.

The lining of the secondary shoe is usually larger than the primary shoe lining.

The last two letters of a lining edge code reads EF. This means ________.

Mechanical fade occurs when the friction material overheats.

On non-servo brakes, which shoe does most of the braking in during forward movement of the vehicle?

Technician A says that the anchor pin (shoe anchor) is used to hold one end of the primary and secondary shoe return springs. Technician B says that shoe anchor prevents the brake shoes from rotating with the drum when the brakes are applied. Which technician is correct?

A leading-trailing brake works well in reverse but not well forward.

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 a pawl controls the teeth of the starwheel adjuster. Which technician is correct?

Technician A says that the labyrinth seal (drum groove) helps to keep water from getting into a drum brake. Technician B says that only synthetic brake grease, lithium brake grease or anti-seize compound should be used as a brake lubricant. Which technician is correct?

Two technicians are discussing drum brake shoes. Technician A says that forward and rear-facing shoes are the same and can be installed in either position on any drum brake system. Technician B says that the darker color linings should always be placed toward the front of the vehicle Which technician is correct?

Drum brake shoes ________.

What type of drum brake system is shown below?

Technician A says that a disadvantage of drum brakes is that they require an adjusting mechanism to maintain the proper clearance between the shoe and drum. Technician B says that a disadvantage of drum brakes is that they pull the car to one side during braking under certain conditions. Which technician is correct?

What type of drum brake system is shown below?