Wheel Cylinder Overhaul

For additional information see Notes, Warinings, and Hints.

Fig 3 Wheel Cylinder:

NOTE: To perform service operations or inspections of the wheel cylinders, it will be necessary to remove the cylinders from the support plate and disassemble on the bench.

CAUTION: Wheel cylinders with cup expanders must have cup expanders after any service procedures (reconditioning or replacement).

DISASSEMBLING WHEEL CYLINDERS
1. Pry boots away from cylinders and remove.
2. Press In on one piston to force out other piston, cup, spring -- with cup expanders -- cup and piston.
3. Wash wheel cylinder, pistons, and spring in clean brake fluid or alcohol.
- Clean thoroughly and blow dry with compressed air.

CAUTION: Do not use a rag as lint from the rag will adhere to bore surfaces.

4. Inspect cylinder bore and piston for scoring and pitting.
- Wheel cylinder bores and pistons that are badly scored or pitted should be replaced.
- Cylinder walls that have light scratches, or show signs of corrosion, can usually be cleaned with crocus cloth, using a circular motion.
- Black stains on the cylinder walls are caused by piston cups and will not impair operation of cylinder.


ASSEMBLING WHEEL CYLINDERS

Assembly Notes:
- Before assembling the pistons and new cups in the wheel cylinders, dip them in clean brake fluid.
- If the boots are deteriorated, cracked or do not fit tightly on the push rods or the cylinder casting, install new boots.

1. Coat cylinder bore with clean brake fluid.
2. Install expansion spring with cup expanders in cylinder. Install cups in each end of cylinder with open end of cups facing each other.
3. Install piston in each end of cylinder having the flat face of each piston contacting the flat face of each cup, already installed.
4. Install a boot over each end of cylinder. Use care not to damage boot.