Drum Brake System: Testing and Inspection

In order to properly inspect the rear brakes, the brake drum must be removed. Check for the following conditions during a drum brake inspection:

1. Inspect the lining material for:
^ Wear beyond service limits
^ Uneven wear
^ Cracks
^ Scoring
^ Gouges
^ Contamination from grease or brake fluid

2. Inspect the rear wheel cylinder for signs of leakage.





3. Check the anti-rattle and return springs for signs of:
^ Heat damage
^ Bends or damage to coils or shank
^ Loss of tension

NOTE: A good spring will make a dull thud when dropped on a concrete floor. A heat-damaged spring that has lost tension will make a distinctive ringing sound when dropped on a concrete floor.

4. Check the brake backing plate shoe support pads for signs of scoring. The support pads must be smooth and have a light coating of lithium grease.
5. Inspect the brake drum for scratches, scoring, bell mouth and out-of-round conditions.