Removal & Installation
For vehicles equipped with Anti-Lock Brakes (ABS), refer to the proper procedures concerning brake system servicing.
- Raise and support the vehicle safely using jackstands. Remove the wheel.
- Disconnect the brake line at the fitting on the brake backing plate.
In most cases the flare fittings that attach the brake lines to the wheel cylinders will be frozen. Clean the fittings with solvent and use penetrating oil to loosen the rust. Use the proper size flare nut wrench to avoid stripping the fitting.
- Remove the brake assemblies. Disconnect the brake line from the rear of the wheel cylinder.
- Remove the screws or nuts that hold the wheel cylinder to the backing plate and remove the wheel cylinder from the vehicle.
- Position the wheel cylinder on the backing plate and start the brake
line in the cylinder fitting.
- Install the cylinder mounting bolts and tighten to 90 inch lbs. (10 Nm).
- To avoid stripping the fitting, tighten the brake line fitting to 11 ft. lbs. (15 Nm) using a flare nut wrench.
See Figures 1 through 10
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.