Brakes and Traction Control: 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. On type 1 brakes, remove wheel cylinder links. Fluid spill from boot center hole indicates cup leakage and need for wheel cylinder replacement. On type 2 and 3 brakes, use a small screwdriver to pry center hole of boot away from piston. If fluid spills from center hole, cup leakage is indicated and wheel cylinder should be replaced. On all types, light fluid coatings on piston within cylinder is considered normal.
3. Inspect backing plate for evidence of axle seal leakage. If leakage exists, refer to individual car chapters for axle seal replacement procedures.
4. Inspect backing plate attaching bolts, and ensure they are tight.
5. Using fine emery cloth or other suitable abrasive, clean rust and dirt from shoe contact surface on backing plate.