Wheel Cylinder Overhaul

For additional information see Notes, Warnings, and Hints. Service Precautions

Wheel Cylinder:

Exploded View:

NOTE: The wheel cylinders should not be disassembled unless there is evidence of excessive brake fluid leakage. A small amount of fluid is normally present behind the boots to provide piston lubrication. This does not indicate the necessity for overhaul.

INSPECTION
Carefully pull the lower edges of the wheel cylinder boots (1) away from the cylinder and determine whether or not the interior is wet with brake fluid. Excessive fluid in this area indicates leakage past the wheel cylinder piston cups and the necessity for overhaul.

DISASSEMBLY
NOTE: Wheel cylinder removal is necessary only for cylinder replacement. An overhaul may be performed with the cylinder attached to the brake backing plate.

1. Remove:
^ The brakeshoes from the backing plate.
^ the boot and piston (1) from each end of the cylinder casting (2)
^ the wheel cylinder rubber cups (3) and the spring and expander assemblies (4) from the cylinder bore
^ the bleeder screw (5)
2. Discard all the original rubber components and wash the other components in brake cleaning fluid.
3. Inspect the pistons and the cylinder bore for scratches, scores or other visible damage. Replace damaged pistons and hone the cylinder bore if necessary.
4. Clean the cylinder bore and bleeder hole with brake cleaning fluid after honing. Dry the components with compressed air.

ASSEMBLY
1. Install all components included in the wheel cylinder repair kit.
2. Apply a light coating of brake fluid to the wheel cylinder bore and the internal components.

3. Install:
^ The return spring and expander assembly (4).
^ The cups (3).
^ The boots and pistons (1) on each end of the cylinder.
^ The bleeder screw (5).