GMC 18015427 Caliper,Front Brake (LH)

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To remove the caliper, follow steps 2-4 of pad replacement, then take out the inner pad, spring clip, and L-shaped retainer. Clean the caliper with denatured alcohol, discard the brake hose copper gasket, and empty the caliper brake fluid. For installation, attach the brake hose with a new gasket, lubricate sleeves and bushings, fit bushings and disc pads, remount the caliper, reconnect brake hose, insert the retainer clip, bleed brakes, and test the vehicle. To overhaul, shield the piston with wood, eject using compressed air, remove the dust boot and bleeder screw, inspect piston and caliper bore. Clean reusable parts, fit new seals, lubricate the caliper bore, reassemble the caliper, install pads, bleed brakes, secure the wheel, and test drive.

To get started with the removal of brake caliper for overhaul, open the brake fluid reservoir and check its level if needed. Then, loosen wheel lug nuts, jack up a vehicle as well as remove the wheels. After that, bottom the piston in the caliper bore and clean it before any hose is disconnected. Lastly, take out mounting bolts and separate caliper from automobile. The replacement will start by taking off brake pads and cleaning outside of calipers. While removing pistons from calipers using compressed air be cautious not to damage them. Take out dust boot and piston seal throwing away any rubber parts. All components are washed and reviewed for possible damages on both piston as well as caliper bore lineages. Lubricate piston bores along with seals then assemble caliper using new bushings plus sleeves For fitting purposes confirm availability of mounting bolts while pushing back piston into its bore where required Place caliper over rotor together with mounting bracket then tighten bolts after checking clearance Install brake hose while bleeding brakes Ditto; finally install wheels lower vehicle and pump brake pedal ensuring contact between pads & rotor.

Remove the disc pads and disconnect the brake flexible hose from the rigid brake line at the support bracket, capping the line to prevent fluid loss. Unbolt and remove the caliper along with the flexible hose, unscrewing the hose from the caliper while noting that the copper sealing gaskets should be replaced upon reconnection. Clean the exterior of the caliper with brake fluid, avoiding gasoline or solvents, and place the assembly on a clean workbench. Drain the fluid from the caliper, then insert a cloth pad between the caliper piston and body, applying air pressure to the fluid inlet hole to free the piston; if unsuccessful, hydraulic fluid pressure may be necessary. With the brake pads removed, reconnect the caliper to the brake line and have an assistant slowly depress the brake pedal to force the piston out, taking care not to damage it. Pry the dust boot out of the caliper bore, then use a small piece of wood or plastic to remove the piston seal from its groove, avoiding metal objects that could cause damage. Remove the caliper bleeder valve and discard the sleeves, bushings, and all rubber parts. Clean the remaining components in brake fluid, allowing them to drain and shaking them to remove excess fluid. Examine the piston for any scoring, nicks, burrs, or loss of plating, replacing parts if defects are found, and check the caliper bore, allowing for light polishing with crocus cloth to remove minor corrosion. Discard any corroded or damaged mounting bolts. When assembling, lubricate the piston bores and seal with clean brake fluid, positioning the seal in the caliper bore groove. Lubricate the piston with clean brake fluid and assemble a new boot in the piston groove with the fold towards the open end. Insert the piston squarely into the caliper bore and apply force to bottom it. Position the dust boot in the caliper counterbore and use a suitable drift to drive it into place, ensuring it is installed evenly below the caliper face. Finally, install the bleeder screw and complete the installation by reversing the removal steps, always using new copper gaskets when connecting the brake hose and bleeding the system of air.

Inspect the mounting bolts and bushings for damage, and lubricate the bushings with silicone grease.

Remove the locknut while holding the parking brake lever, then take out the lever, seal, and washer, inspecting for wear.

Examine the piston for defects and check the caliper bore, allowing light polishing for minor corrosion.

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