Hummer H3. Manual — part 1048

FRONT BRAKE SHIELD REPLACEMENT

Preliminary Procedures

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

2. Remove the tire and wheel. Refer to Tire and Wheel Removal and Installation .

NOTE:

Support the brake caliper with heavy mechanic wire or equivalent, whenever it is separated from its
mount and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this
manner will cause the flexible brake hose to bear the weight of the caliper, which may cause
damage to the brake hose and in turn may cause a brake fluid leak.

1

Disc Brake Rotor Retainer (Qty: 2)

2

Brake Caliper Bracket Bolt (Qty: 2)

Tip: Do NOT reuse the brake caliper bracket mounting bolts. Replace the
bolts.

Tighten: 135 N.m (100 lb ft)

NOTE:

Refer to Fastener Notice .

3

Brake Caliper and Bracket Assembly
Tip:

Position the brake caliper and bracket assembly aside and support with
heavy mechanics wire or equivalent.

It is not necessary to disconnect the flexible brake hose.

4

Disc Brake Rotor
Tip:

If the disc brake rotor will not slide over the park brake shoes, remove
the rubber access plug on the backing plate and rotate the park brake
shoe adjuster screw to provide clearance.

Burnish the brake pads and rotors. Refer to Brake Pad and Rotor
Burnishing.

2007 Hummer H3

2007 BRAKES Disc Brakes - H3

Fig. 26: Disc Brake Splash Shield Replacement - Front
Courtesy of GENERAL MOTORS CORP.

Front Brake Shield Replacement

Callout

Component Name

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Preliminary Procedures

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

2. Remove the tire and wheel. Refer to Tire and Wheel Removal and Installation .

3. Remove the wheel hub assembly. Refer to Front Wheel Hub, Bearing and Seal

Replacement .

CAUTION:

Refer to Brake Dust Caution .

CAUTION:

Refer to Brake Fluid Irritant Caution .

1

Front Brake Shield

2007 Hummer H3

2007 BRAKES Disc Brakes - H3

REAR DISC BRAKE BACKING PLATE REPLACEMENT

Fig. 27: Disc Brake Backing Plate Replacement - Rear
Courtesy of GENERAL MOTORS CORP.

Rear Disc Brake Backing Plate Replacement

Callout

Component Name

Preliminary Procedure

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

2. Remove the tire and wheel. Refer to Tire and Wheel Removal and Installation .

3. Remove the axle shaft. Refer to Rear Axle Shaft Replacement .

4. Remove the park brake shoe. Refer to Parking Brake Shoe Replacement .

CAUTION:

Refer to Brake Dust Caution .

1

Park Brake Actuator

2

Park Brake Cable Anchor Pin Nut (Qty: 2)

NOTE:

Refer to Fastener Notice .

2007 Hummer H3

2007 BRAKES Disc Brakes - H3

BRAKE ROTOR ASSEMBLED LATERAL RUNOUT CORRECTION

Review the following acceptable methods for bringing the brake rotor assembled LRO to within
specifications. Determine which method to use for the specific vehicle being repaired.

Brake Rotor Assembled Lateral Runout Correction - Indexing

The indexing method of correcting assembled LRO is most effective when the LRO
specification is only exceeded by a relatively small amount: 0.025-0.127 mm (0.001-0.005
in). Indexing is used to achieve the best possible match of high spots to low spots between
related components.

Brake Rotor Assembled Lateral Runout Correction - On Vehicle Lathe

The on-vehicle brake lathe method is used to bring the LRO to within specifications through
compensating for LRO while refinishing the brake rotor.

If the assembled LRO cannot be corrected using these methods, then other components must be
suspected as causing and/or contributing to the LRO concern.

BRAKE ROTOR ASSEMBLED LATERAL RUNOUT CORRECTION - INDEXING

Tighten: 72 N.m (530 lb ft)

3

Park Brake Rear Cable Bracket

4

Rear Brake Backing Plate Bolt (Qty: 4)

Tighten: 135 N.m (100 lb ft)

5

Rear Brake Backing Plate

IMPORTANT:

Brake rotor thickness variation MUST be checked BEFORE
checking for assembled lateral runout (LRO). Thickness
variation exceeding the maximum acceptable level can cause
brake pulsation. Refer to Brake Rotor Thickness Variation
Measurement.

Brake rotor assembled lateral runout (LRO) exceeding the
maximum allowable specification can cause thickness
variation to develop in the brake rotor over time, usually
between 4 800-11 300 km (3,000-7,000 mi). Refer to Brake
Rotor Assembled Lateral Runout Measurement.

2007 Hummer H3

2007 BRAKES Disc Brakes - H3