Hummer H3. Manual — part 1039

Fig. 5: 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

firmly by hand in a star-pattern.

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

2007 Hummer H3

2007 BRAKES Disc Brakes - H3

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

8. If the brake rotor has been REFINISHED or REPLACED with a new rotor, proceed to step

14.

9. If the brake rotor meets the following criteria, proceed to step 10.

The rotor is within specifications and is being REUSED.

The rotor has NOT been refinished.

The rotor does NOT exhibit thickness variation exceeding the maximum allowable
level.

2007 Hummer H3

2007 BRAKES Disc Brakes - H3

Fig. 6: Mounting Dial Indicator To Measure Lateral Runout
Courtesy of GENERAL MOTORS CORP.

10. Mount a dial indicator, J 45101 or equivalent, to the steering knuckle and position the

indicator button so it contacts the brake rotor friction surface at a 90 degree angle,
approximately 13 mm (0. See Special Tools.5 in) from the outer edge of the rotor.

11. Measure and record the assembled LRO of the brake rotor.

1. Rotate the rotor until the lowest reading is displayed on the indicator dial, then set the

dial to zero.

2. Rotate the rotor until the highest reading is displayed on the dial.

3. Mark the location of the high spot relative to the nearest wheel stud or studs.

4. Measure and record the amount of LRO.

12. Compare the brake rotor assembled LRO to the following specification:

Specification:

Front brake rotor maximum allowable assembled lateral runout: 0.13 mm (0.005 in)

Rear brake rotor maximum allowable assembled lateral runout: 0.13 mm (0.005 in)

13. If the brake rotor assembled LRO is within specifications, proceed to step 18.

If the brake rotor assembled LRO exceeds the specification, refinish the rotor to ensure true
parallelism. Refer to Brake Rotor Refinishing. After refinishing the rotor, proceed to step
14.

14. Mount a dial indicator, J 45101 or equivalent, to the steering knuckle and position the

indicator button so it contacts the brake rotor friction surface at a 90 degree angle,
approximately 13 mm (0. See Special Tools.5 in) from the outer edge of the rotor.

15. Measure and record the assembled LRO of the brake rotor.

1. Rotate the rotor until the lowest reading is displayed on the indicator dial, then set the

dial to zero.

2. Rotate the rotor until the highest reading is displayed on the dial.

3. Mark the location of the high spot relative to the nearest wheel stud or studs.

4. Measure and record the amount of LRO.

16. Compare the brake rotor assembled LRO to the following specification:

Specification:

Front brake rotor maximum allowable assembled lateral runout: 0.13 mm (0.005 in)

2007 Hummer H3

2007 BRAKES Disc Brakes - H3

Rear brake rotor maximum allowable assembled lateral runout: 0.13 mm (0.005 in)

17. If the brake rotor assembled LRO measurement exceeds the specification, bring the LRO to

within specifications. Refer to Brake Rotor Assembled Lateral Runout Correction.

18. If the brake rotor assembled LRO measurement 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.

BRAKE PAD INSPECTION

CAUTION: Refer to Brake Dust Caution .

2007 Hummer H3

2007 BRAKES Disc Brakes - H3