DRUM BRAKES

Heat created by braking, in combination with stretching and constant compression, causes these parts to lose their correct tension. Weak springs cannot return the brake shoes completely and weak hold down parts permit the shoes to bind and rattle, all resulting in premature wear.
Adjusting parts are also subjected to heat and stress, as well as normal wear and should also be replaced. Stressed or stretched springs and cables, worn levers, and rusted or worn adjusting screws will prevent the brakes from adjusting. Lack of adjusting will affect brake performance and could cause total loss of rear brakes.