Chevrolet Silverado / GMC Sierra. Service manual — part 1514

FRONT BRAKE CALIPER OVERHAUL (JH6, JH7)

Disassembly Procedure

1. Remove the brake caliper. Refer to Front Brake Caliper Replacement (JH6, JH7) or

Front Brake Caliper Replacement (JD9, JF3, JF7).

2. Drain all the brake fluid from the caliper.

3. Secure the brake caliper in a suitable holding device.

4. Insert a piece of wood in the brake caliper between the pistons and the outer bridge.

5

Procedure

1. Bleed the hydraulic brake system. Refer to Hydraulic Brake System

Bleeding (Pressure) or Hydraulic Brake System Bleeding (Manual) .

2. After the installation is complete and with the engine OFF, gradually

apply the brake pedal to approximately 2/3 of its travel distance.

3. Slowly release the brake pedal.

4. Wait 15 seconds, then repeat steps 2-3 until a firm brake pedal is obtained.

This will properly seat the brake caliper piston and the brake pads.

5. Fill the master cylinder to the proper level. Refer to Master Cylinder

Reservoir Filling .

CAUTION: Refer to Brake Dust Caution .

CAUTION: Refer to Brake Fluid Irritant Caution .

CAUTION: Do not place your fingers in front of the piston in order to

catch or protect the piston while applying compressed
air. This could result in serious injury.

IMPORTANT: The brake calipers use phenolic pistons that have stainless

steel caps which contact the brake pads. Use compressed air
to remove the piston from the brake caliper.

2008 Chevrolet Silverado 1500

2008 BRAKES Disc Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 21: Applying Air To Brake Caliper
Courtesy of GENERAL MOTORS CORP.

5. Cover the brake caliper with a shop towel.

6. Apply filtered, non-lubricated compressed air into the brake hose inlet fitting port of the

brake caliper.

2008 Chevrolet Silverado 1500

2008 BRAKES Disc Brakes - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 22: 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. 23: 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