Drum Brake System: Testing and Inspection

Remove the brake drum.

Check for the following conditions:
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 brake shoe hold-down and retracting springs for signs of:
^ Heat damage
^ Bends or damage to coils or shank
^ Loss of tension

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

4. Check the brake backing plate for signs of scoring. The shoe contact points 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.