Drum Brake System: Testing and Inspection

1. Inspect components for damage and unusual wear. Replace as necessary.
2. Inspect wheel cylinders. Boots which are torn, cut, or heat damaged indicate need for wheel cylinder replacement. Fluid spilling from boot center hole, or wetness around wheel cylinder ends indicates cup leakage and need for wheel cylinder replacement. A small amount of fluid is always present and is considered normal, acting as a lubricant for the cylinder pistons.
3. Inspect backing plate for evidence of seal leakage. If leakage exists, refer to individual car chapters for axle seal replacement procedure.
4. Inspect backing plate attaching bolts and ensure they are tight.
5. Check adjuster screw operation. If satisfactory, lightly lubricate adjusting screw and washer with suitable brake lube. If operation is unsatisfactory, replace.
6. Using fine emery cloth or other suitable abrasive, clean rust and dirt from shoe contact surfaces on backing plate.