Installation Procedure

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Do not use abrasives to clean the brake caliper piston.

If cracks, scoring, pitting, excessive rust, and/or excessive corrosion are present in the caliper bore, replace the caliper assembly.
If light rust or light corrosion are present in the caliper bore, attempt to remove the imperfection with a fine emery paper. If the imperfection cannot be removed, replace the caliper assembly.
Clean the brake caliper piston bore and seal counterbore, the caliper piston, and the caliper sleeves with denatured alcohol, or equivalent.
Dry the caliper piston bore and counterbore, the piston, and the sleeves with non-lubricated, filtered air.
Inspect the caliper piston for cracks, scoring, damage to the chrome plating, and/or damage to the integral adjusting mechanism. Replace the caliper piston if any of these conditions exist.
Inspect the caliper mounting holes for cracks, scoring, pitting, rust, and/or excessive corrosion. Replace the caliper assembly if any of these conditions exist.

Fig 1: View Of Piston Seal

Courtesy of GENERAL MOTORS CORP.

Lubricate the new piston seal with Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667) or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
Install the lubricated, new piston seal into the caliper bore.

Fig 2: Identifying Caliper Piston & Piston Dust Boot Seal

Courtesy of GENERAL MOTORS CORP.

Install the new dust boot seal onto the caliper piston (2).

Fig 3: Illustrating Rotating Piston In Caliper Body

Courtesy of GENERAL MOTORS CORP.

Insert the caliper piston into the caliper bore; using a spanner type wrench, rotate the piston (2) clockwise to fully seat the piston into the caliper body (1).

Fig 4: View Of Dust Boot Retaining Ring

Courtesy of GENERAL MOTORS CORP.

Fully seat the piston dust boot seal in the seal counterbore.
Install the piston dust boot seal retaining ring to the groove in the caliper seal counterbore.
Install the brake caliper to the vehicle. Refer to Rear Brake Caliper Replacement (JL9) or Rear Brake Caliper Replacement (J65) .
Inspect the brake caliper for brake fluid leaks while performing the hydraulic brake system bleeding procedure after the caliper has been installed to the vehicle. If the brake caliper leaks brake fluid from the FRONT of the caliper past the piston dust boot seal, replace the caliper piston assembly. The piston integral adjustment mechanism contains a non-serviceable seal which may be allowing brake fluid to leak past it through a bleed hole near the end of the caliper piston.