REMOVAL & INSTALLATION
See Figures 1, 2 and 3
- Raise the rear of the vehicle and support it safely using jackstands.
- Remove the wheel and the brake drum.
- Remove the brake shoes. Refer to the procedure earlier in this section.
- Disconnect the hydraulic brake line and washer from the rear of the wheel cylinder. Plug the openings to prevent excessive fluid loss or contamination.
- Remove the bleeder valve and cap.
- Remove the wheel cylinder retaining bolts, then remove the cylinder from the backing plate.
- Install the cylinder to the backing plate and tighten the retainers to 89 inch lbs. (10 Nm).
- Connect the hydraulic brake line using NEW washers and tighten the fastener to 36 ft. lbs. (49 Nm).
- Install the bleeder valve and tighten to 66 inch lbs. (7.5 Nm), then install the cap.
- Install the brake shoes and drum.
- Properly bleed the hydraulic brake system.
- Install the wheel assembly, then remove the supports and carefully lower the vehicle.
- Apply and release the brake pedal at least 20 times to make sure the shoes are properly seated in the drum.
See Figures 4 through 13
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.