Exam 51: Drum Brakes

Explain the operation of an integral drum brake parking brake.

After machining, the brake drum must be at least ____________________ inch smaller than the discard diameter stamped or cast into the drum.

Non-servo type brakes are normally found on what type of vehicle?

What is lining heat fade?

Duo-servo drum brake systems are being discussed. Technician A says the primary shoe lining is often thicker than the secondary shoe lining. Technician B says the primary shoe typically has more lining surface area than the secondary shoe. Who is correct?

On a duo-servo brake, the primary shoe is connected to the secondary shoe by the ____________________.

Heat checks are visible only after the drum has been machined.

Why is it important to clean a brake drum after machining it?

Identify five nonbrake component concerns that may affect braking performance.

Brake shoes containing significant amounts of ____________________ dust can be a potential health hazard.

Duo-servo drum brakes are also known as what type of brake assembly?

The last two letters printed on the edge of the shoe lining indicate ____.

When must a wheel cylinder be replaced?

What must be done first to remove a brake drum that is ridged and cannot be pulled past the edge of the shoes?

A grinding noise when the brakes are applied could be caused by ______.

Small lightweight cars often use duo-servo drum brake designs to reduce brake lockup.

What does the term duo-servo mean?

The left rear brake drum is scored, but the right rear drum looks as good as new. Technician A says the left-side drum should be resurfaced and the right-side drum should be reinstalled without resurfacing. Technician B says both sides should be remachined to a similar diameter. Who is correct?

Explain how drum brakes create a self-multiplying [self-energizing] brake force.

Some vehicles use a(n) ____________________ motor to release the parking brake when the engine is running and the transmission is in a forward driving gear.