Hummer H2. Manual — part 826

2004 BRAKES

Park Brake - Hummer H2

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

Fastener Tightening Specifications

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC STARTING POINT - PARK BRAKE

Begin the system diagnosis by reviewing the system description and 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. Refer to Symptoms - Park Brake in order to identify the
correct procedure for diagnosing the system and where the procedure is located.

SYMPTOMS - PARK BRAKE

Refer to Park Brake System Description and Operation .

Visual/Physical Inspection

z

Inspect for aftermarket devices which could affect the operation of the park brake system.

z

Inspect the easily accessible or visible system components for obvious damage or conditions which could
cause the symptom.

Symptom List

Application

Specification

Metric

English

Caliper Mounting Bracket to Axle Flange Nuts

135 N.m

100 lb ft

Cable Support Bracket Bolts

85 N.m

64 lb ft

Park Brake Cable Guide to Frame Bolt

12 N.m

106 lb in

Park Brake Cable to Rear Axle Clip Bolt

25 N.m

18 lb ft

Park Brake Cable to Shock Absorber Bracket Bolt

25 N.m

18 lb ft

Park Brake Lever Mounting Bolts

25 N.m

18 lb ft

Park Brake Warning Lamp Switch Bolt

3 N.m

25 lb in

IMPORTANT: Review the system operation in order to familiarize yourself with the system

functions.

2004 Hummer H2

2004 BRAKES Park Brake - Hummer H2

2004 Hummer H2

2004 BRAKES Park Brake - Hummer H2

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

Park Brake Will Not Hold or Release

PARK BRAKE WILL NOT HOLD OR RELEASE

Park Brake Will Not Hold or Release

PARK BRAKE SYSTEM DIAGNOSIS

Park Brake System Diagnosis

Step

Action

Yes

No

1

Were you sent here from the Park Brake Symptom table?

Go to

Step 2

Go to Diagnostic Starting

Point - Park Brake

2

Inspect the park brake system for proper operation. Refer to
Park Brake System Diagnosis .
Did you find and correct a condition?

Go to

Step 5

Go to Step 3

3

Inspect the disc brake system for proper operation. Refer to
Disc Brake System Diagnosis in Hydraulic Brakes.
Did you find and correct a condition?

Go to

Step 5

Go to Step 4

4

Inspect the hydraulic brake system for proper operation. Refer
to Hydraulic Brake System Diagnosis in Hydraulic Brakes.
Did you find and correct a condition?

Go to

Step 5

Go to Diagnostic Starting

Point - Park Brake

5

Road test the vehicle in order to confirm proper operation.
Refer to Brake System Vehicle Road Test in Hydraulic
Brakes.
Is the condition still present?

Go to

Step 2

System OK

Step

Action

Yes

No

DEFINITION: This diagnostic table is designed to diagnose ONLY the components of the PARK brake
system in order to determine if the PARK brake system is operating properly. You will be directed by
the appropriate Symptom Table to go to other brake system diagnostic tables as appropriate.

1

Were you sent here from a Hydraulic Brake Symptom
Table?

Go to Step 4

Go to Step 2

2

Were you sent here from a Park Brake Symptom Table?

Go to Step 4

Go to Step 3

3

Is the symptom related to the ability of the park brake
system to hold and/or release?

Go to Diagnostic

Starting Point -

Park Brake

Go to Diagnostic

Starting Point -

Hydraulic Brakes in

Hydraulic Brakes

4

1. Raise and support the vehicle with the rear axle

supported by jack stands. Refer to Lifting and
Jacking the Vehicle in General Information.

2. Shift the transmission into NEUTRAL.

3. With the park brake RELEASED, attempt to

rotate the rear wheels to check the rear brakes for

2004 Hummer H2

2004 BRAKES Park Brake - Hummer H2

a significant amount of drag.

Do the rear brakes have a significant amount of drag?

Go to Step 11

Go to Step 5

5

1. Shift the transmission into NEUTRAL.

2. Apply the park brake.

3. Attempt to rotate the rear wheels to check the rear

brakes for a significant amount of drag.

Do the rear brakes have a significant amount of drag?

Go to Step 6

Go to Step 7

6

1. Release the park brake.

2. Rotate the rear wheels to check the rear brakes for

a significant reduction in the amount of drag.

Did the rear brakes exhibit a significant reduction in the
amount of drag?

Go to Step 22

Go to Step 11

7

Visually check the park brake cable connections and the
cables that are accessible on the UNDERSIDE of the
vehicle for disconnections and/or damage.
Were any or the park brake cables disconnected and/or
damaged?

Go to Step 8

Go to Step 9

8

Reconnect or replace the park brake cables as necessary.
Refer to the following procedures as necessary:

z

Park Brake Cable Replacement - Front

z

Park Brake Cable Replacement - Left Rear

z

Park Brake Cable Replacement - Right Rear

Did you complete the repair and/or replacement?

Go to Step 9

-

9

Check the adjustment of the park brake. Refer to Park
Brake Adjustment .
Was the park brake adjusted properly?

Go to Step 11

Go to Step 10

10

Adjust the park brake. Refer to Park Brake
Adjustment .
Were you able to attain adjustment of the park brake?

Go to Step 16

Go to Step 11

11

1. Remove the rear brake rotors. Refer to Brake

Rotor Replacement - Rear in Disc Brakes.

NOTE:

Do not depress the brake pedal with the brake rotors
and/or the brake drums removed, or with the brake
calipers repositioned away from the brake rotors, or
damage to the brake system may result.

2004 Hummer H2

2004 BRAKES Park Brake - Hummer H2

2. Inspect the park brake shoe hardware for

looseness, damaged, broken or missing
components.

3. Check the park brake actuators for a seized

condition.

Does the park brake hardware and/or the park brake
actuators require replacement?

Go to Step 12

Go to Step 13

12

1. Replace park brake hardware components as

necessary. Refer to Park Brake Shoe
Replacement .

2. Replace the park brake actuators as necessary.

Refer to Park Brake Actuator Replacement .

Did you complete the replacement?

Go to Step 13

-

13

Have an assistant apply and release the park brake,
while you observe the park brake cables for free
movement.
Did the park brake cables move freely?

Go to Step 14

Go to Step 17

14

Check the adjustment of the park brake. Refer to Park
Brake Adjustment .
Was the park brake adjusted properly?

Go to Step 16

Go to Step 15

15

Adjust the park brake. Refer to Park Brake
Adjustment .
Were you able to attain adjustment of the park brake?

Go to Step 16

Go to Step 25

16

1. With the transmission still in NEUTRAL, apply

the park brake.

2. Attempt to rotate the rear wheels to check the rear

brakes for a significant amount of drag.

3. Release the park brake.

4. Rotate the rear wheels to check the rear brakes for

a significant reduction of drag.

Did the park brake apply and release properly?

Go to Step 27

Return to Symptom

Table

17

Disconnect the park brake cable connections that are
accessible on the UNDERSIDE of the vehicle one at a
time and check each cable for free movement.
Do any of the park brake cables accessible on the
underside of the vehicle require replacement?

Go to Step 18

Go to Step 19

Replace any of the park brake cables that do not have
free movement and/or are not releasing properly. Refer
to the following procedures as necessary:

z

Park Brake Cable Replacement - Front

2004 Hummer H2

2004 BRAKES Park Brake - Hummer H2