REMOVAL & INSTALLATION
See Figures 1, 2, 3 and 4
- Disconnect the negative battery cable.
- Remove some of the brake fluid from the master cylinder reservoir. The reservoir should be no more than 1 / 2 full.
- Raise the vehicle and support safely.
- Remove the appropriate tire and wheel assembly. Loosen the parking brake cable adjusting nut.
- Remove the brake drum.
- Remove the shoe-to-lever spring and the shoe-to-shoe spring.
- Remove the auto adjuster assembly.
- Disconnect the brake line connection from the rear of the brake backing plate. Plug or cap the line to avoid contaminating the system.
- Unfasten the retainers, then remove the wheel cylinder from the brake backing plate.
- If necessary, remove the bleeder screw.
- If removed, install the bleeder screw and tighten to 6 ft. lbs. (8 Nm).
- Position the wheel cylinder to the backing plate and secure with the retainers. Tighten to 7 ft. lbs. (10 Nm).
- Unplug the brake pipe, then connect and tighten to 11 ft. lbs. (15 Nm).
- Install the auto adjuster, shoe-to-shoe spring and shoe-to-lever spring.
- Install the brake drum.
- Install the wheel and tire assembly, then carefully lower the vehicle.
- Properly bleed the brake system, as outlined earlier in this section.
See Figures 5 through 14
Wheel cylinder overhaul kits may be available, but often at little or no savings over a reconditioned wheel cylinder. It often makes sense with these components to substitute a new or reconditioned part instead of attempting an overhaul.
If no replacement is available, or you would prefer to overhaul your wheel cylinders, the following procedure may be used. When rebuilding and installing wheel cylinders, avoid getting any contaminants into the system. Always use clean, new, high quality brake fluid. If dirty or improper fluid has been used, it will be necessary to drain the entire system, flush the system with proper brake fluid, replace all rubber components, then refill and bleed the system.
- Remove the wheel cylinder from the vehicle and place on a clean workbench.
- First remove and discard the old rubber boots, then withdraw the pistons. Piston cylinders are equipped with seals and a spring assembly, all located behind the pistons in the cylinder bore.
- Remove the remaining inner components, seals and spring assembly. Compressed air may be useful in removing these components. If no compressed air is available, be VERY careful not to score the wheel cylinder bore when removing parts from it. Discard all components for which replacements were supplied in the rebuild kit.
- Wash the cylinder and metal parts in denatured alcohol or clean brake fluid.
- Allow the parts to air dry or use compressed air. Do not use rags for cleaning, since lint will remain in the cylinder bore.
- Inspect the piston and replace it if it shows scratches.
- Lubricate the cylinder bore and seals using clean brake fluid.
- Position the spring assembly.
- Install the inner seals, then the pistons.
- Insert the new boots into the counterbores by hand. Do not lubricate the boots.
- Install the wheel cylinder.