Buick 18015427 Caliper,Front Brake (LH)

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To remove the caliper, perform steps 2-4 of the pad replacement procedure, then remove the inner pad, the pad support spring clip from the piston, the caliper from the hanger, and the Li-shaped retainer from the fitting. Clean the outside of the caliper with denatured alcohol, remove the brake hose and discard the copper gasket, and remove the brake fluid from the caliper. To install, install the brake hose into the caliper using a new copper gasket, lubricate the new sleeves and rubber bushings, install the bushings in the caliper ears, install the shoe support spring in the piston, install the disc pads in the caliper, remount the caliper on the hub, reconnect the brake hose to the steel brake line, install the retainer clip, bleed the brakes, replace the wheels, check the brake fluid level, check the brake pedal travel, and road test the vehicle. To overhaul, place a slat of wood in front of the piston, remove the piston by applying compressed air to the fluid inlet fitting, remove the piston dust boot, remove the bleeder screw and cap from the caliper, inspect the piston for scoring, nicks, corrosion, wear, and damaged or worn chrome plating, remove the piston seal from the caliper bore groove, inspect the caliper bore for nicks, corrosion and so on, clean any parts which are to be reused in denatured alcohol, install the bleeder screw, lubricate a new seal, install the seal in its groove, install the new dust boot on the piston, lubricate the bore of the caliper with clean brake fluid and insert the piston into its bore, position the boot in the caliper housing and seat it with a seal driver of the appropriate size, install the caliper bushings, lubricate the beveled end that is flush with the caliper, install the pads, the caliper and bleed the brakes, install the wheel and tire assembly, hand-tighten the lug nuts, lower the vehicle, then tighten the lug nuts to 100 ft. lbs., and road test the vehicle.

To remove the brake caliper for overhaul, start by removing the cover from the brake fluid reservoir and adjusting the fluid level if necessary. Then, loosen the wheel lug nuts, raise the vehicle, and remove the wheels. Next, bottom the piston in the caliper bore and clean the brake hose before removing it. Finally, remove the mounting bolts and detach the caliper from the vehicle. To overhaul the caliper, begin by removing the brake pads and cleaning the exterior of the caliper. Use compressed air to remove the piston from the caliper, being careful not to damage it. Remove the dust boot and piston seal, and discard any rubber parts. Clean all the parts and inspect the piston and caliper bore for any damage. Lubricate the piston bores and seal, then assemble the caliper with new bushings and sleeves. For installation, inspect the mounting bolts and push the piston back into its bore if necessary. Place the caliper over the rotor and mounting bracket, tighten the bolts, and check the clearance. Install the brake hose and inlet fitting bolt, and bleed the brakes if necessary. Finally, install the wheels and lower the vehicle, and depress the brake pedal to ensure proper contact between the pads and rotor.

Before removing the brake caliper for overhaul, you should remove the cover from the brake fluid reservoir and adjust the fluid level if necessary.