GM 25983764
Caliper, Front Driver Side

Start brake caliper service and repair by emptying all brake fluid and working carefully while compressing air to remove the pistons. Set the brake caliper in place using the engine support fixture (J41358-B) for stable holding. Push wood through the caliper while protecting it with a towel and send non-lubricated filtered air to eject the pistons. When one Piston does not exit position the removed Piston first then put a wood block between the Piston and the caliper before tightening the c-clamp and applying air pressure again. Using tools made for the task remove pistons and Piston seals from the brake caliper while also removing the bleeder valve cap and valve from the housing. Use denatured alcohol to clean all parts then clean with filtered compressed air. Replace the pistons or brake caliper when you find material loss, chemical reactions, eating away, or physical damage to the Piston parts. Apply filtered lubricated compressed air to clean the brake caliper assembly and then apply denatured alcohol to wipe it dry. Place one Piston bore at a time into clean dot-3 brake fluid right before you put in the dust and Piston seals while keeping the Piston vertically aligned. Install the Piston dust seal using the universal driver handle (J8092) and boot seal installer (J45863) along with installing and tightening the bleeder valve to 19 nm (14 ft. Lbs.). Close the process by replacing the bleeder valve cap.

Place a block of wood against the inside of the caliper body opposite the piston and apply low-pressure compressed air through the caliper inlet hose.

Ensure the piston is straight and level during installation.

Lubricate the caliper bolts with silicone grease, avoiding the threads, and lubricate the 2 bolt boots in the caliper bracket with silicone grease.

Remove the brake hose-to-caliper bolt, discarding the 2 copper brake hose gaskets. Plug the opening in the rear brake hose to prevent excessive fluid loss, then remove the caliper bolts (1 and 3) and the caliper from the rotor and caliper bracket.

Hand tighten 2 wheel lug nuts to retain the rotor to the hub.

Reinstall the rear brake caliper onto the vehicle.

Place the caliper over the rotor and caliper bracket, ensuring bushings are in place.