GM 89060219
Caliper

Check the brake master cylinder reservoir fluid before you replace the front brake caliper (JE5). The technician should drain fluid until it reaches the midpoint between the max-full and minimum limits. Check that the vehicle rests on supports before removing the tire wheel assembly. Press a large c-clamp on the brake caliper to push the piston into the bore so the caliper can pass the brake rotor. Then release the clamp. Follow these steps to detach the brake hose from the caliper: first remove the brake hose to caliper bolt and discard the two copper brake hose gaskets while plugging all openings to stop fluid loss. First disconnect the brake caliper from its bracket by removing the bracket pin bolts. Place the caliper guide pin boots in their correct position before installing the caliper. To reuse the caliper pin bolts first clean threads and holes with denatured alcohol before applying thread locker gm p/n 12345493 (Canadian P/N 10953488) to 2/3 of the lower caliper bracket bolt threaded length. Wait 10 minutes for curing. High temperature silicone brake lubricant should be applied to brake caliper pin bolts before installation where torques need to be applied to 34 n.m (25 lb ft). Connect the brake hose to the caliper after installing new copper hose gaskets and tighten the bolt up to 50 n.m (37 lb ft). Perform hydraulic brake bleeding through brake pedal application to 2/3 of its range then slow release until pedal firmness returns. Repeat this procedure until pedal achieves sufficient firmness. Lease install the tire and wheel assembly before the vehicle reaches the ground level.

Use low pressure compressed air to ease the pistons out of the bores, taking care to avoid injury.

Pad the interior again and cover the open caliper bore with another block of wood before repeating the process for the remaining piston.

Inspect the fluid level in the brake master cylinder reservoir; if it is above the midway point between the maximum-full and minimum allowable levels, remove fluid to that midway point.

Universal Driver (J8092) and Caliper Boot Seal Installer (J 45507).

Dry the components with non-lubricated, filtered air and inspect for any damage.

Clean the threads and threaded holes with denatured alcohol, then apply thread-locker GM P/N 12345493 (Canada P/N 10953488) to two-thirds of the threaded length of the lower caliper bracket bolts.

Plug the openings in the brake caliper and hose.

Remove and discard them using a small wooden or plastic tool.

Tighten it to 14 Nm (124 inch lbs.).

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

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

Denatured alcohol.

Gradually apply the brake pedal to approximately 2/3 of its travel distance, slowly release it, and repeat until a firm pedal is obtained.