Chevrolet Silverado / GMC Sierra. Manual — part 1517
Fig. 30: Clamping Brake Caliper
Courtesy of GENERAL MOTORS CORP.
7. If one of the pistons fails to be removed from the brake caliper, perform the following steps.
1. Reposition the piston that has been removed back into the brake caliper.
2. Using a small block of wood and a C-clamp, slowly tighten the C-clamp until the
piston is half way into the brake caliper. It does not have to be fully seated.
3. Position a second block of wood in front of the piston that remains in the brake
caliper.
2008 Chevrolet Silverado 1500
2008 BRAKES Disc Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
4. Cover the brake caliper with a shop towel.
5. Apply filtered, non-lubricated compressed air into the brake hose inlet fitting port of
the brake caliper.
Fig. 31: Exploded View Of Brake Caliper
Courtesy of GENERAL MOTORS CORP.
8. Remove the pistons (3) from the caliper bores.
9. Remove the boots (4) from the caliper bores. Do not scratch the caliper bores.
10. Remove the piston seals (2) from the caliper bores. Do not use a metal tool.
11. Remove the bleeder valve cap (5).
12. Remove the bleeder valve (6) from the caliper housing (1).
2008 Chevrolet Silverado 1500
2008 BRAKES Disc Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
13. Clean the bleeder valve, the caliper bores, the caliper passages and the pistons with
denatured alcohol. Dry the parts and blow out the brake fluid passages using filtered, non-
lubricated compressed air.
14. Replace the pistons or the caliper if any of the following conditions exist:
Scoring in the caliper bores
Corrosion in the caliper bores
Pitting in the caliper bores
Damage to the pistons (phenolic)
15. Clean the brake caliper assembly with denatured alcohol.
16. Dry with filtered, non-lubricated compressed air.
Assembly Procedure
1. Apply a small amount of clean DOT-3 brake fluid to the piston, piston seal, and piston bore.
IMPORTANT: When applying the clean brake fluid to the piston bores,
piston seals and pistons, only apply the brake fluid to one
bore at a time. This is done to ensure the brake caliper, seals
and pistons DO NOT become contaminated with dirt or other
foreign material.
2008 Chevrolet Silverado 1500
2008 BRAKES Disc Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 32: View Of Brake Caliper Piston Seal
Courtesy of GENERAL MOTORS CORP.
2. Install the square-cut piston seal in the brake caliper bore groove.
3. Ensure the square-cut piston seal is not twisted.
2008 Chevrolet Silverado 1500
2008 BRAKES Disc Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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