REMOVAL AND INSTALLATION
- Raise and safely support the vehicle.
- Remove the wheel and tire assemblies.
- Remove the brake drum and remove the brake shoes.
- Disconnect and plug the brake fluid line from the wheel cylinder.
- Remove the wheel cylinder retaining bolt.
- Remove the wheel cylinder from the backing plate.
See Figure 1
- Install the wheel cylinder in position on the backing plate.
- Install the retaining bolts and tighten to 15 ft. lbs. (20 N.).
- Connect the brake line to the wheel cylinder.
- Install the brake linings and the brake drum.
- Install the wheel and tire assembly. Lower the vehicle.
- 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.
- 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.
See Figure 2
- 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.
See Figures 3 and 4
- Wash the cylinder and metal parts in denatured alcohol or clean brake fluid.
See Figures 5 and 6
- 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.
See Figure 7
- Lubricate the cylinder bore and seals using clean brake fluid.
- Position the spring assembly.
- Install the inner seals, then the pistons.
See Figures 8, 9 and 10
- Insert the new boots into the counterbore by hand. Do not lubricate the boots.
See Figure 11
- Install the wheel cylinder.
- Bleed the brake system.
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