G5 L4-2.2L (2007)
7. Using a small wooden or plastic tool, remove the piston seal from the caliper bore and discard the piston seal.
8. Inspect the operation of the integral park brake mechanism: Rotate the park brake lever back and forth while observing the movement of the park
brake mechanism actuator assembly in the caliper bore.
Important: The park brake lever, lever return spring and actuator shaft seal are not serviceable components of the integral park brake
mechanism. Do not disassemble the integral park brake mechanism.
9. If the integral park brake mechanism was not operating properly, binding or seized, replace the brake caliper assembly.
Important: Do not use abrasives to clean the brake caliper piston.
10. If cracks, scoring, pitting, excessive rust, and/or excessive corrosion are present in the caliper bore, replace the caliper assembly.
11. 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.
12. Clean the brake caliper piston bore and seal counterbore, the caliper piston, and the caliper sleeves with denatured alcohol, or equivalent.
13. Clean the brake caliper piston bore and seal counterbore, the caliper piston, and the caliper sleeves with denatured alcohol, or equivalent.
14. Dry the caliper piston bore and counterbore, the piston, and the sleeves with non-lubricated, filtered air.
15. 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.
16. Inspect the caliper mounting holes for cracks, scoring, pitting, rust, and/or excessive corrosion. Replace the caliper assembly if any of these
conditions exist.
Installation Procedure
1. Lubricate the new piston seal with GM approved, or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
2. Install the lubricated, new piston seal into the caliper bore.
