Hummer H3. Manual — part 1313

6

damage.

2. Inspect the drum portion of the rotors

for excessive wear, blueing
discoloration and heat spots.

3. If any of these conditions are present,

replace the affected components.

4. Adjust the park brake system.

Did you find and correct a condition?

Go to Step 14

Go to Step 7

7

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

Go to Step 14

Go to Step 8

8

1. Inspect the disc brake system for the

following conditions:

Binding, incorrectly installed or
missing caliper hardware and/or
lining hardware-Ensure free
movement of linings and of
caliper, if equipped with sliding
type caliper

Lack of lubrication or excessive
corrosion on metal to metal
contact surfaces

Distorted or damaged linings

Damaged or excessively worn
caliper hardware and/or lining
hardware

Bent or damaged caliper or
mounting component

2. Adjust, repair or replace components

as necessary. Refer to Disc Brake
System Diagnosis.

Did you find and correct a condition?

Go to Step 14

Go to Step 9

1. Separate the brake booster pushrod

from the brake pedal.

2007 Hummer H3

2007 BRAKES Hydraulic Brakes - H3

9

2. Inspect the brake corners to determine

if the brake drag condition is still
present.

Do the brake corners still exhibit the brake
drag condition?

Go to Step 11

Go to Step 10

10

1. Inspect the pushrod for improper

positioning and/or damage. Correctly
position or replace the pushrod if
necessary.

2. Inspect the brake pedal assembly for

damage and replace if necessary.

Did you complete the repair or
replacement?

Go to Step 14

-

11

1. For vacuum boost systems, disconnect

the vacuum check valve from the
booster to relieve vacuum reserve.

2. Separate the master cylinder from the

brake booster. Do not disconnect any
brake pipes.

3. Inspect the brake corners to determine

if the brake drag condition is still
present.

Do the brake corners still exhibit the brake
drag condition?

Go to Step 13

Go to Step 12

12

Replace the brake booster assembly.
Did you complete the replacement?

Go to Step 14

-

13

1. Inspect the hydraulic brake system for

the following conditions.

Improper operation of caliper
pistons

Contaminated brake fluid

Internally damaged flexible
brake hoses; hindering brake
release

2007 Hummer H3

2007 BRAKES Hydraulic Brakes - H3

BRAKE SYSTEM SLOW RELEASE

Brake System Slow Release

Damaged or improperly
operating master cylinder

2. Adjust, repair or replace components

as necessary. Refer to Hydraulic
Brake System Diagnosis.

Did you find and correct a condition?

Go to Step 14

Go to
Diagnostic
Starting Point -
Hydraulic
Brakes

14

1. Install or connect components that

were removed or disconnected during
diagnosis.

2. Road test the vehicle in order to

confirm proper operation. Refer to
Brake System Vehicle Road Test.

Is the condition still present?

Go to Step 2

System OK

Step

Action

Yes

No

DEFINITION: Brake system releases and returns to rest slowly; vehicle motion is hindered
by brake system briefly after release of brake pedal.

1

Were you sent here from the Hydraulic
Brake Symptom table?

Go to Step 2

Go to
Diagnostic
Starting Point -
Hydraulic
Brakes

2

1. Inspect the hydraulic brake system for

the following conditions:

Improper operation of caliper
pistons

Internally damaged flexible
brake hoses; hindering brake
release

Contaminated brake fluid

Damaged or improperly
operating master cylinder

2007 Hummer H3

2007 BRAKES Hydraulic Brakes - H3

2. Adjust, repair or replace components

as necessary. Refer to Hydraulic
Brake System Diagnosis.

Did you find and correct a condition?

Go to Step 5

Go to Step 3

3

1. Inspect the brake assist system for the

following conditions:

Binding, bent or damaged pedal
pushrod, pedal or pedal bracket

Damaged or improperly
operating vacuum booster, if
equipped

Restricted return hose from
hydraulic booster, if equipped

Damaged or improperly
operating hydraulic booster, if
equipped

2. Adjust, repair or replace components

as necessary. Refer to Brake Assist
System Diagnosis.

Did you find and correct a condition?

Go to Step 5

Go to Step 4

4

1. Inspect the disc brake system for the

following conditions:

Damaged or excessively worn
caliper hardware and/or lining
hardware

Distorted or damaged linings

Lack of lubrication or excessive
corrosion on metal to metal
contact surfaces

Bent or damaged caliper or
mounting component

2. Adjust, repair or replace components

as necessary. Refer to Disc Brake
System Diagnosis.

Go to
Diagnostic
Starting Point -
Hydraulic

2007 Hummer H3

2007 BRAKES Hydraulic Brakes - H3