Hummer H2. Manual - part 784

1. Raise and support the vehicle.  

2. Remove the tire and wheel.  

3. Remove the rear brake caliper bracket with the rear brake caliper. See BRAKE CALIPER BRACKET 

under REMOVAL & INSTALLATION.  

4. Remove the rear brake rotor. See BRAKE ROTOR under REMOVAL & INSTALLATION.  

5. Inspect and replace the park brake shoe and lining if any excessive wear is indicated by the park brake 

lining being worn down to the shoe, the brake lining is cracking or if there is oil or fluid contamination of 
the brake lining.  

6. Adjust the park brake shoe. See PARK BRAKE ADJUSTMENT .  

7. Install the rear brake rotor. See BRAKE ROTOR under REMOVAL & INSTALLATION.  

8. Install the rear brake caliper with the rear brake caliper bracket. See BRAKE CALIPER BRACKET 

under REMOVAL & INSTALLATION.  

9. Install the tire and wheel.  

10. Lower the vehicle.  

PARK BRAKE ADJUSTMENT 

Park Brake Shoe Adjustment 

1. Set the Drum-To-Brake Shoe Clearance Gage (J-21177-A) so that it contacts the inside diameter of the 

rotor. See Fig. 10 .  

2. Position the drum-to-brake shoe clearance gage over the shoe and the lining at the widest point. See Fig. 

11 .  

WARNING:

Avoid grinding brake linings, sanding brake linings or cleaning wheel 
brake parts with a dry brush or with compressed air, when servicing 
wheel brake parts. Some models or aftermarket brake parts may contain 
asbestos fibers which can become airborne in dust. Breathing dust with 
asbestos fibers may cause serious bodily harm. Use a water-dampened 
cloth in order to remove any dust on brake parts. Equipment is available 
commercially in order to perform this washing function. These wet 
methods prevent fibers from becoming airborne. 

WARNING:

Avoid grinding brake linings, sanding brake linings or cleaning wheel 
brake parts with a dry brush or with compressed air, when servicing 
wheel brake parts. Some models or aftermarket brake parts may contain 
asbestos fibers which can become airborne in dust. Breathing dust with 
asbestos fibers may cause serious bodily harm. Use a water-dampened 
cloth in order to remove any dust on brake parts. Equipment is available 
commercially in order to perform this washing function. These wet 
methods prevent fibers from becoming airborne. 

NOTE:

The park brake shoes must be adjusted before the park brake pedal is adjusted. 

 

2004 Hummer H2 

2003-04 BRAKES Disc - Hummer

  

3. Turn the adjuster nut until the lining just contacts the drum-to-brake shoe clearance gage.  

4. Repeat steps 1 - 3 for the opposite side.  

5. The clearance between the park brake shoe and the rotor is 0.026" (0.6604 mm).  

Fig. 10: Setting Gauge On Inside Diameter Of Rotor 
Courtesy of GENERAL MOTORS CORP.

 

2004 Hummer H2 

2003-04 BRAKES Disc - Hummer

  

Fig. 11: Positioning Gauge On Shoe & Lining 
Courtesy of GENERAL MOTORS CORP. 

Park Brake Pedal Adjustment 

Verify that the self adjuster lock-out pin has be removed. Fully apply and release the park brake pedal 3 times.  

TROUBLESHOOTING 

NOTE:

Before you adjust the park brake, verify that the park brake shoes are adjusted 
to provide a clearance of 0.026" (0.6604 mm). 

 

2004 Hummer H2 

2003-04 BRAKES Disc - Hummer

  

DIAGNOSTIC STARTING POINTS 

Hydraulic Brake System 

Begin the system diagnosis by reviewing the system description and operation. See HYDRAULIC BRAKE 
SYSTEM DESCRIPTION and HYDRAULIC BRAKE SYSTEM OPERATION under DESCRIPTION & 
OPERATION. Reviewing the description and operation information will help you determine the correct 
symptom diagnostic procedure when a malfunction exists. Reviewing the description and operation information 
will also help you determine if the condition described by the customer is normal operation. See GENERAL 
DIAGNOSIS in order to identify the correct procedure for diagnosing the system and where the procedure is 
located.  

Disc Brake System 

Begin the disc brake system diagnosis with hydraulic brakes. See HYDRAULIC BRAKE SYSTEM . The use 
of the diagnostic starting point will lead to the identification of the correct procedure for diagnosing the system 
and where the procedure is located.  

Park Brake System 

Begin the system diagnosis by reviewing the system description and operation. See PARK BRAKE SYSTEM 
DESCRIPTION and PARK BRAKE SYSTEM OPERATION under DESCRIPTION & OPERATION. 
Reviewing the description and operation information will help you determine the correct symptom diagnostic 
procedure when a malfunction exists. Reviewing the description and operation information will also help you 
determine if the condition described by the customer is normal operation. See PARK BRAKE SYSTEM under 
GENERAL DIAGNOSIS in order to identify the correct procedure for diagnosing the system and where the 
procedure is located.  

GENERAL DIAGNOSIS 

Hydraulic Brake System 

Perform the brake system vehicle road test before using the brake symptom tables in order to duplicate the 
customer's concern. See BRAKE SYSTEM VEHICLE ROAD TEST . Review the system description and 
operation in order to familiarize yourself with the system functions. See DESCRIPTION & OPERATION .  

Inspect for aftermarket devices which could affect the operation of the hydraulic brake system. See 
CHECKING AFTERMARKET ACCESSORIES . Inspect the easily accessible or visible system 
components for obvious damage or conditions which could cause the symptom. Inspect the brake fluid reservoir 
for the proper brake fluid level. Faulty electrical connections or wiring may be the cause of intermittent 
conditions.  

Park Brake System 

Review the system operation in order to familiarize yourself with the system functions. See PARK BRAKE 
SYSTEM under DESCRIPTION & OPERATION. 

 

2004 Hummer H2 

2003-04 BRAKES Disc - Hummer