Some vehicles may be equipped dual piston calipers. The procedure to overhaul the caliper is essentially the same with the exception of multiple pistons, O-rings and dust boots.
- Remove the caliper from the vehicle and place on a clean workbench.
Depending upon the vehicle, there are two different ways to remove the piston from the caliper. Refer to the brake pad replacement procedure to make sure you have the correct procedure for your vehicle.
The first method is as follows:
- Stuff a shop towel or a block of wood into the caliper to catch the piston.
Remove the caliper piston using compressed air applied into the caliper inlet hole. Inspect the piston for scoring, nicks, corrosion and/or worn or damaged chrome plating. The piston must be replaced if any of these conditions are found.
- For the second method, you must rotate the piston to retract it from the caliper.
- If equipped, remove the anti-rattle clip.
- Use a prytool to remove the caliper boot, being careful not to scratch the housing bore.
- Remove the piston seals from the groove in the caliper bore.
- Carefully loosen the brake bleeder valve cap and valve from the caliper housing.
- Inspect the caliper bores, pistons and mounting threads for scoring or excessive wear.
- Use crocus cloth to polish out light corrosion from the piston and bore.
- Clean all parts with denatured alcohol and dry with compressed air.
- Lubricate and install the bleeder valve and cap.
- Install the new seals into the caliper bore grooves, making sure they are not twisted.
- Lubricate the piston bore.
- Install the pistons and boots into the bores of the calipers and push to the bottom of the bores.
- Use a suitable driving tool to seat the boots in the housing.
- Install the caliper in the vehicle.
- Install the wheel and tire assembly, then carefully lower the vehicle.
- Properly bleed the brake system.
Removal & Installation
- Before servicing the vehicle, refer to the Precautions Section.
- Loosen the wheel lug nuts.
- Raise and safely support the front of the vehicle. Remove the wheel.
Remove the two caliper slide pin bolts and lift the caliper from the anchor plate.
NOTEUse care to retain as much of the original caliper slide pin grease as possible.
- Position the caliper on a frame member or suspend it with some wire. Do not allow the caliper to hang by the brake hose.
- Disconnect and plug the brake hose at the caliper. Remove the caliper from the rotor.
- Position the caliper over the brake pads and align the slide pin mounting holes.
- Install the slide pin bolts and torque to specification.
- Install the caliper brake hose using new washers. Tighten the bolt to 25 ft. lbs. (34 Nm)
- Install the wheel and snug the lug nuts.
Lower the vehicle and tighten the lug nuts to 100 ft. lbs. (135 Nm).
NOTEThe first couple of times you apply the brakes, the pedal may go to the floor. Continue to pump the brake pedal until it feels firm.
- Start the engine and apply the brakes several times to readjust the caliper pistons. Ensure that the pedal feels firm before operating the vehicle.
- Check and adjust the brake fluid level, as required.