REMOVAL & INSTALLATION
See Figures 1 and 2
- Raise and safely support the vehicle.
- Remove the wheel and tire assembly.
- Remove the brake drum, as outlined earlier in this section.
- Remove the brake shoes, adjuster and retracting springs assembly from the brake backing plate, as previously outlined.
- Disconnect and plug the brake line wheel cylinder, behind the backing plate.
- Remove the wheel cylinder-to-backing plate bolts, then remove the wheel cylinder.
Before connecting, wipe the ends of the rear brake lines with a clean cloth to remove any foreign matter.
- Position the wheel cylinder on the brake backing plate, then finger-tighten the brake line to the wheel cylinder.
- Secure the wheel cylinder to the backing plate using the retaining bolts. Tighten the bolts to 8-10 ft. lbs. (10-14 Nm).
- Using a tube nut wrench, install the tube nut fitting, then tighten to 11-15 ft. lbs. (15-20 Nm).
- Install, then adjust the brakes, following the procedure earlier in this section.
- Install the brake drum, followed by the tire and wheel assembly.
- Bleed the brake system before attempting to drive the vehicle. For details, please refer to the procedure earlier in this section.
- Lower and road test the vehicle.
See Figures 3 and 4
Wheel cylinders need not be rebuilt unless they are leaking or seized. To check the wheel cylinder for leakage, carefully pull the lower edge of the rubber end boot away from the cylinder. A slight amount of fluid in the boot is normal, but excessive brake fluid in the boot or running out of the boot (when the edges are pulled away from the cylinder) denotes leakage.
It is not necessary to remove the cylinder from the brake backing (mounting) plate to rebuild the cylinder, however removal makes the job easier.
- Disengage and remove the rubber boots from both ends of the wheel cylinder. The piston should come out with the boot. If not, remove the piston by applying finger pressure inward on one piston; the piston on the opposite end should come out. Take care not to splash brake fluid all over yourself when the piston pops from the cylinder.
- Remove the rubber cups, center expander and spring from the wheel cylinder. Remove the bleeder screw from the back of the cylinder.
- Discard all rubber boots and cups. Wash the pistons and cylinder in denatured alcohol or clean brake fluid.
- Inspect the pistons for scratches, scoring or other visible damage. Inspect the cylinder bore for score marks or rust. The cylinder may be honed (with a brake cylinder hone) if necessary. Do not hone more than 0.003 in. (0.076mm) beyond original diameter. If the scoring or pitting is deeper, replace the cylinder.
- After honing the cylinder, wash again with alcohol or clean brake fluid. Check the bleeder screw hole to make sure it is opened. Wipe the cylinder bore with a clean cloth. Install the bleeder screw.
- Never reuse the old rubber parts. Always use all of the parts supplied in the rebuilding kit.
- Apply a light coating of brake fluid or the special lubricant (if supplied with the rebuilding kit) on the pistons, rubber cups and cylinder bore.
- Insert the spring and expander assembly into the cylinder bore. Put the cups (facing inward) and the pistons into the cylinder. Install the boots and fit the outer lips into the retaining grooves on the outer edges of the wheel cylinder.
- If removed, install the wheel cylinder onto the backing plate, then connect the brake line. Be sure that the inlet port (where the brake hose connects) is toward the rear of the car.
- Install the brake shoes, drum and wheel assembly.
- Adjust and bleed the brake system. Road test the car.