Air Break Practice Test

Results

#1. If drum brakes overheat, the vehicle's stopping distance will increase. What is the reason for this?

The drums will expand.

Air pressure will drop.

Friction between the tire and the pavement surface will decrease.

The wheels will lock up.

In a drum brake, a brake shoe contacts the inner surface of the brake drum, and the resulting friction slows the wheel. If the drum brake overheats, the brake drum will expand away from the brake shoe to the point that braking effectiveness is reduced. This is known as brake fade.