Hummer H3. Manual — part 1049

Tools Required

J 39544-KIT Complete Torque Socket Set-10 Pieces or equivalent. See Special Tools.

J 45101-100 Conical Brake Rotor Washers. See Special Tools.

Procedure

CAUTION: Refer to Brake Dust Caution .

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

Fig. 28: Identifying J 45101-100 & Lug Nut
Courtesy of GENERAL MOTORS CORP.

1. Remove the J 45101-100 and the lug nuts that were installed during the assembled LRO

measurement procedure. See Special Tools.

2. Inspect the mating surface of the hub/axle flange and the brake rotor to ensure that there are

no foreign particles or debris remaining.

3. Index the brake rotor in a different orientation to the hub/axle flange.

4. Hold the rotor firmly in place against the hub/axle flange and install one of the J 45101-100

(1) and one lug nut (2) onto the upper-most wheel stud.

2007 Hummer H3

2007 BRAKES Disc Brakes - H3

5. Continue to hold the rotor secure and tighten the lug nut firmly by hand.

Fig. 29: Identifying Brake Rotor
Courtesy of GENERAL MOTORS CORP.

6. Install the remaining J 45101-100 and lug nuts onto the wheel studs and tighten the nuts

2007 Hummer H3

2007 BRAKES Disc Brakes - H3

firmly by hand in a star-pattern. See Special Tools.

7. Using the J 39544-KIT or equivalent, tighten the lug nuts in a star-pattern to specification,

in order to properly secure the rotor. See Special Tools. Refer to Tire and Wheel
Removal and Installation .

8. Measure the assembled LRO of the brake rotor. Refer to Brake Rotor Assembled Lateral

Runout Measurement.

9. Compare the amount of change between this measurement and the original measurement.

10. If this measurement is within specifications, proceed to step 14.

11. If this measurement still exceeds specifications, repeat steps 1-9 until the best assembled

LRO measurement is obtained.

12. Matchmark the final location of the rotor to the wheel studs if the orientation is different

than it was originally.

13. If the brake rotor assembled LRO measurement still exceeds the maximum allowable

specification, refer to Brake Rotor Assembled Lateral Runout Correction.

14. If the brake rotor assembled LRO is within specification, install the brake caliper and

depress the brake pedal several times to secure the rotor in place before removing the J
45101-100 and the lug nuts. See Special Tools.

BRAKE ROTOR ASSEMBLED LATERAL RUNOUT CORRECTION - ON VEHICLE LATHE

Tools Required

J 39544-KIT Complete Torque Socket Set-10 Pieces or equivalent. See Special Tools.

J 41013 Rotor Resurfacing Kit. See Special Tools.

J 42450-A Wheel Hub Resurfacing Kit. See Special Tools.

J 45101 Hub and Wheel Runout Gage. See Special Tools.

J 45101-100 Conical Brake Rotor Washers. See Special Tools.

CAUTION: Refer to Brake Dust Caution .

IMPORTANT:

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).

Brake rotor thickness variation MUST be checked BEFORE

2007 Hummer H3

2007 BRAKES Disc Brakes - H3