GM 18023387
Caliper Overhaul Kit, Rear

Before starting the overhaul of rear brake caliper, it will be needed to remove it from the transport. Next, apply low pressure compressed air through the fluid inlet hole to draw the Brake Caliper Piston from the caliper others through the fluid inlet hole. Take off the piston dust boot seal from seal counterbore are located inside the caliper using a small wood or plastic tool and throw away after that the piston seal from boom caliper. Then, remove the bleeder valve and cap from the caliper. One should avoid using abrasives for cleaning the Brake Caliper Piston. Clean the counterbore on the Brake Caliper Piston bore and seal as well as the Brake Caliper Piston with the use of denatured alcohol or an alternative. Dry these components with non lubricated denied air and check the caliper bore for any cracks, scoring and pitting, rust and corrosions. If any light rust or corrosion is detected, try to remove it using fine emery paper; otherwise, replace the caliper assembly. For any cracks, scoring, pitting or any excessive corrosion, the caliper assembly also has to be replaced. Check the chrome plating on the caliper piston for the same and replace the same. To install, apply delco supreme 11 (GMP/N12377967), or equivalent dot-3 brake fluid from a clean, sealed container, and push the new piston seal into the caliper bore. Next, slide the caliper piston into the bore and cover it with the new piston dust boot seal. Fit a dust boot seal with a seal installer tool or equivalent in order to fully seat the dust boot seal for a specified counterbore diameter of 38.1 mm (1.50 inch), or a piston bore diameter of 48.0 mm (1.89 inch). Lastly, reinstall the bleeder valve and cap on the caliper, but tighten the valve well, and mount the rear brake caliper onto the niche.

To replace the rear Brake Caliper Bracket, first, remove the caliper from the mounting bracket and then secure it with heavy mechanics wire or some other tool while still having the hydraulic brake flexible hose attached. Second, uninstall the rear brake pads, then proceed to uninstall the caliper bracket bolts, before finally removing the caliper bracket. Iparameters prior to installation should be cleaned and visually inspected to ensure the proper clamp load using the threads of the caliper bracket bolts as well as the mounting holes of the knuckle. Threadlocker gm p/n 12345493 (Canadian P/N 10953488) or other should be applied to Brake Caliper Bracket bolt threads. Install the caliper bracket using bracket bolts and tighten them to 115 nm (85 ft. Lbs.). At last, put on the rear brake pads and the caliper.

You must follow braking dust safety measures and keep the flex hose connected while supporting the brake caliper during the process of replacing the rear Brake Caliper Bracket. Remove the caliper from its mounting bracket then support it using heavy mechanics wire or suitable alternative. Prolonging the hydraulic brake flexible hose installation is unnecessary. The process starts with removing the rear brake pads and continues with the removal of caliper bracket bolts and caliper bracket . It is vital to perform thread cleaning on caliper bracket bolts as well as to clean the mounting holes in the knuckle for achieving correct clamp force. Use threadlocker gm p/n 12345493 (Canadian P/N 10953488) and its equivalent to secure the Brake Caliper Bracket bolts threads. The caliper bracket needs to be mounted with its bracket bolts and tightened to 115 nm (85 ft. Lbs.). Place the rear brake pads on and finish by installing the caliper.

First support the brake caliper using mechanical wire or an equivalent tool while it remains disconnected from its mount but the hydraulic flexible brake hose stays connected since operating otherwise will potentially cause hose damage and fluid leakage. Start the process by removing the caliper from its mounting bracket while maintaining hydraulic brake flexible hose connection. Later remove the current brake pads. Proceed by taking out both caliper bracket bolts followed by the caliper bracket. The installation process starts by scrubbing and examining the caliper bracket bolt threads and the knuckle mounting holes to make certain that clamp force will be adequate. Use threadlocker gm p/n 12345493 (Canadian P/N 10953488) to treat the threads of caliper bracket bolts before installing the bracket using these bolts which should be torqued to 115 nm (85 ft. Lbs.). The last step involves the installation of rear brake pads followed by the caliper.

Check for scoring, nicks, corrosion, or worn chrome plating, and replace it if any issues are found.

With Delco Supreme 11 (GM P/N 12377967) or equivalent DOT-3 brake fluid from a clean, sealed container.

The bleeder valve and cap.

Tighten the caliper bolts (1 and 3) to 44 Nm (32 ft. lbs.).

Lubricate the new piston seal with Delco Supreme II, GM P/N 12377967, or equivalent DOT-3 brake fluid from a clean, sealed container.

Reinstall it and tighten to 54 Nm (40 ft. lbs.).

Reduce it to the midway point.

Clean any dirt or corrosion near the brake hose fitting, then remove the brake caliper bolts and take off the brake caliper from the bracket.

Inspect the caliper bolt boots for cuts, tears, or deterioration, and check the caliper bolts for corrosion or damage.

Plug the openings in the brake caliper and hose.

Replace the caliper assembly.

Raise and support the vehicle, then remove the tire and wheel.

Remove one-third of the brake fluid from the master cylinder.

Apply threadlocker, GM P/N 12345493 (Canadian P/N 10953488), to the threads.

Install the brake caliper bolts and tighten them to 35 Nm (26 ft. lbs.).

Lubricate the new piston seal with Delco Supreme II (R), GM P/N 12377967 (Canadian P/N 992667) or equivalent, using DOT-3 brake fluid from a clean, sealed container.

Remove the caliper bracket bolts (part number 654321) and take off the caliper bracket (part number 789012).

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

Place it over the caliper piston and compress the piston to the bottom of the bore, ensuring the dust boot seal is fully seated in the caliper counterbore.

The counterbore diameter is 38.1 mm (1.50 inch) and the piston bore diameter is 48.0 mm (1.89 inch).

Hand tighten 2 wheel lug nuts to retain the rotor to the hub, and install a large C-clamp over the top of the brake caliper against the back of the outboard brake pad, tightening it until the caliper piston is pushed into the caliper bore enough to slide the caliper off the rotor.

Tighten them to 44 Nm (32 ft. lbs.).

Replace the caliper housing.