Drum brakes use brake shoes to provide the necessary fiction material to stop a vehicle. Unlike disc brake systems, drum brakes rely on springs to move the shoes away from the drum lining. Drum brakes always rely on either self (most common) or manual adjusters to keep the shoes the proper distance from the drum lining.
Over time the shoe material is worn away. The hardware that holds the brake shoes in place, and the springs that return the shoes the proper location also wear out over time and should be replaced with every set of shoes.
Signs of worn brake shoes:
- Grinding, squealing, or screeching sound
- Vibration or pulsation when applying brakes
- Having to press the pedal further to engage