REMOVAL & INSTALLATION
The ABS hydraulic modulator is capable of self-pressurizing and can generate pressures above 3000 psi. any time the ignition switch is turned ON. Relieve the system pressure before testing or repairing the hydraulic system. Make sure the ignition switch stays OFF and pump the brake pedal 25-35 times to relieve the system pressure. Improper repair or test procedures can cause serious or fatal injury.
- Raise and safely support the vehicle on jackstands and remove the wheels.
- Loosen the hydraulic line at the caliper, then remove the caliper from the carrier. With guide pin calipers, be sure to hold the pin with a back-up wrench when removing the caliper bolts. On cars with solid front rotors, remove the brake caliper to wheel bearing housing bolts.
- Remove the caliper from the hydraulic line and cap the line to prevent fluid leakage.
- Remove the brake pad wear sensor if equipped.
- The carrier can be removed by removing the 2 bolts.
- If removed, install the carrier. On standard brakes, tighten the carrier bolts to 52 ft. lbs. (70 Nm). On ABS brakes, tighten the carrier bolts to 92 ft. lbs. (125 Nm).
- Thread the caliper onto the hydraulic line and hand-tighten it. Fit the caliper into place on the carrier.
- On calipers with guide pins, tighten the bolts to 25 ft. lbs. (35 Nm). On calipers with sleeves and bushings, tighten the bolts to 18 ft. lbs. (25 Nm).
- Tighten the hydraulic line and bleed the brakes.
- Remove the caliper from the vehicle and place on a clean workbench.
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.