REMOVAL & INSTALLATION
See Figure 1
- Raise and safely support the vehicle. Remove the wheel and tire assembly.
- Remove the brake shoes.
- Clean all the dirt from around the wheel cylinder and rear brake line.
- Unfasten the brake pipe fitting and disconnect and plug the rear brake line.
- Remove the wheel cylinder mounting bolts, then remove the wheel cylinder from the brake backing plate.
- Place wheel cylinder into position and hold in place with a wooden block placed between the wheel cylinder and axle flange. Install the retaining bolts and tighten the bolts to 13 ft. lbs. (18 Nm).
- Unplug and connect the rear brake pipe. Tighten the pipe fitting to 13 ft. lbs. (18 Nm).
- Install the brake shoes.
- Install the wheel and tire assembly, then carefully lower the vehicle.
- Properly bleed the brake system.
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.
See Figures 2 through 11
- 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.