Hummer H3. Manual — part 1050

Procedure

1. Matchmark the position of the brake rotor to the wheel studs if this has not been done

already.

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

no foreign particles, corrosion, rust or debris remaining. If the wheel hub/axle flange and/or
if the brake rotor mating surfaces exhibit these conditions, perform the following steps:

1. Remove the brake rotor from the vehicle. Refer to Front Brake Rotor Replacement

and/or Rear Brake Rotor Replacement .

2. Using the J 42450-A , thoroughly clean any rust or corrosion from the mating surface

of the hub/axle flange. See Special Tools.

3. Using the J 41013 , thoroughly clean any rust or corrosion from the mating surface of

the brake rotor.

4. Clean the friction surfaces of the brake rotor with denatured alcohol or an equivalent

approved brake cleaner.

3. Install the rotor to the hub/axle flange using the matchmark made prior to removal.

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

IMPORTANT: Whenever the brake rotor has been separated from the

hub/axle flange, any rust or contaminants should be cleaned
from the hub/axle flange and the brake rotor mating surfaces.
Failure to do this may result in excessive assembled lateral
runout (LRO) of the brake rotor, which could lead to brake
pulsation.

2007 Hummer H3

2007 BRAKES Disc Brakes - H3

Fig. 30: Identifying J 45101-100 & Lug Nut
Courtesy of GENERAL MOTORS CORP.

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. See Special Tools.

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

2007 Hummer H3

2007 BRAKES Disc Brakes - H3

Fig. 31: 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