Hummer H3. Manual — part 1339

Front Brake Hose Replacement

Rear Brake Hose Replacement

Front Brake Caliper Replacement

Rear Brake Caliper Replacement

2. Clean out all the hydraulic brake pipes using denatured alcohol or equivalent.

3. Dry the brake pipes using non-lubricated, filtered air.

4. Repair or replace ALL of the following components listed and install them to the

vehicle. Each component contains internal rubber seals/linings which have been
contaminated by the contaminated brake fluid in the brake hydraulic system.

Refer to the procedures indicated:

Clean the brake master cylinder reservoir using denatured alcohol or equivalent,
then dry the reservoir using non-lubricated, filtered air. Inspect the reservoir for
cracks and/or damage and replace if necessary. Refer to

Master Cylinder

Reservoir Replacement

.

Replace the brake master cylinder reservoir cap.

Front Brake Hose Replacement

Rear Brake Hose Replacement

Front Brake Caliper Overhaul or Front Brake Caliper Replacement

Rear Brake Caliper Overhaul or Rear Brake Caliper Replacement

HBCi components

4. If the brake fluid was NOT contaminated with an oil-based or a silicone-based substance,

but WAS contaminated with water or dirt, rust, corrosion, and/or brake dust, replace the
brake master cylinder reservoir cap which may have allowed the moisture or particles to
enter the hydraulic system.

5. Fill the brake master cylinder reservoir to the maximum-fill level with brake and clutch

fluid Super DOT-4, GM P/N 88958860 (Canadian P/N 88901244) or equivalent DOT-4
brake fluid from a clean, sealed brake fluid container.

6. Pressure bleed the hydraulic brake system. Begin the procedure with the pressure bleeder

reservoir filled to the maximum-fill level with the correct brake fluid as indicated. Refer to
Hydraulic Brake System Bleeding (Manual) or Hydraulic Brake System Bleeding
(Pressure).

POWER BRAKE BOOSTER INLET HOSE REPLACEMENT

2007 Hummer H3

2007 BRAKES Hydraulic Brakes - H3

Special Tools

CH-47830 Holding Fixture

Removal Procedure

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

Discard the brake fluid into an approved container.

2. Remove the brake master cylinder and power brake booster assembly. Refer to Brake

Master Cylinder with Power Brake Booster and Chassis Control Module
Replacement (LHD) or Brake Master Cylinder with Power Brake Booster and
Chassis Control Module Replacement (RHD) .

3. Install the CH-47830 to the master cylinder assembly.

4. Position the CH-47830 with the master cylinder assembly in a vise.

CAUTION: Refer to Brake Fluid Irritant Caution .

2007 Hummer H3

2007 BRAKES Hydraulic Brakes - H3

Fig. 46: Identifying Brake Booster Inlet/Outlet Hoses
Courtesy of GENERAL MOTORS CORP.

5. Release the power brake booster inlet hose clamps (1).

6. Remove the power brake booster inlet hose (2).

Installation Procedure

2007 Hummer H3

2007 BRAKES Hydraulic Brakes - H3

Fig. 47: Identifying Brake Booster Inlet/Outlet Hoses
Courtesy of GENERAL MOTORS CORP.

1. Install the power brake booster inlet hose (2).

2. Install the power brake booster inlet hose clamps (1).

3. Remove the master cylinder assembly from the CH-47830 .

4. Install the brake master cylinder and power brake booster assembly. Refer to Brake

Master Cylinder with Power Brake Booster and Chassis Control Module
Replacement (LHD) or Brake Master Cylinder with Power Brake Booster and
Chassis Control Module Replacement (RHD) .

POWER BRAKE BOOSTER OUTLET FRONT PIPE REPLACEMENT

Special Tools

2007 Hummer H3

2007 BRAKES Hydraulic Brakes - H3