Chevrolet Silverado / GMC Sierra. Service manual — part 2379

8. Place the brake fluid level sensor into the reservoir, press into place to secure the sensor

retaining tabs.

9. Remove the master cylinder from the vice.

10. Install the master cylinder. Refer to Master Cylinder Replacement (JD9, JF3, JF7) or

Master Cylinder Replacement (JH6, JH7).

11. Release the park brake.

12. Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding (Pressure)

or Hydraulic Brake System Bleeding (Manual).

MASTER CYLINDER REPLACEMENT (JD9, JF3, JF7)

Fig. 12: Master Cylinder Replacement (JD9, JF3, JF7)
Courtesy of GENERAL MOTORS CORP.

Callout

Component Name

CAUTION:

Refer to Brake Fluid Irritant Caution .

NOTE:

Refer to Brake Fluid Effects on Paint and Electrical Components Notice .

2008 Chevrolet Silverado 1500

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

MASTER CYLINDER REPLACEMENT (JH6, JH7)

Preliminary Procedures

1. With the engine OFF, apply the brake pedal several times until the brake pedal

becomes firm to deplete the vacuum brake booster vacuum reserve.

2. Using a suitable tool, remove the brake fluid from the brake master cylinder reservoir.

3. Discard the brake fluid into an approved container.

1

Master Cylinder Fluid Level Sensor Electrical Connector

2

Brake Pipe Fitting (Qty: 2)

Procedure

1. Remove any dirt or debris from the brake pipe fitting.

2. Cap the brake pipe fittings to prevent brake fluid loss and contamination.

Tighten: 25 N.m (18 lb ft)

NOTE:

Refer to Fastener Notice .

3

Brake Master Cylinder Nut (Qty: 2)

Tighten: 33 N.m (24 lb ft)

4

Brake Master Cylinder Assembly

5

Brake Master Cylinder to Vacuum Booster Seal

Procedure

1. Inspect the brake master cylinder to vacuum booster seal for damage and

replace if necessary.

2. Ensure the brake master cylinder to vacuum booster seal is properly seated

against the base of the brake master cylinder.

Do not place the brake master cylinder to vacuum booster seal in the
groove of the master cylinder body.

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

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

2008 Chevrolet Silverado 1500

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

Fig. 13: Master Cylinder Replacement (JH6, JH7)
Courtesy of GENERAL MOTORS CORP.

Callout

Component Name

Preliminary Procedures

1. Using a suitable tool, remove the brake fluid from the brake master cylinder reservoir.

2. Discard the brake fluid into an approved container.

CAUTION:

Refer to Brake Fluid Irritant Caution .

NOTE:

Refer to Brake Fluid Effects on Paint and Electrical Components Notice .

1

Master Cylinder Fluid Level Sensor Electrical Connector

2

Brake Pipe Fitting (Qty: 2)

Procedure

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

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

MASTER CYLINDER BENCH BLEEDING

1. Remove any dirt or debris from the brake pipe fitting.

2. Cap the brake pipe fittings to prevent brake fluid loss and contamination.

Tighten: 25 N.m (18 lb ft)

3

Brake Master Cylinder Nut (Qty: 2)

Tighten: 33 N.m (24 lb ft)

4

Brake Master Cylinder Assembly

Procedure

1. Remove and discard the push-on nuts on the master cylinder mounting

studs, if equipped.

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

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

CAUTION: Refer to Brake Fluid Irritant Caution .

NOTE:

Refer to Brake Fluid Effects on Paint and Electrical Components
Notice .

NOTE:

When adding fluid to the brake master cylinder reservoir, use only
Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or
equivalent DOT-3 brake fluid from a clean, sealed brake fluid
container. The use of any type of fluid other than the recommended
type of brake fluid, may cause contamination which could result in
damage to the internal rubber seals and/or rubber linings of
hydraulic brake system components.

2008 Chevrolet Silverado 1500

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