Hummer H3. Manual — part 1045

FRONT BRAKE CALIPER OVERHAUL (WITH RPO BRM)

2. During installation lubricate the new piston seals with Delco®

Supreme 11 GM P/N 12377967 (Canadian P/N 992667) or equivalent
DOT-3 brake fluid from a clean, sealed brake fluid container.

6

Front Disc Brake Caliper
Tip:

Inspect the caliper bore and housing for cracks, scoring, pitting,
excessive rust, and/or excessive corrosion. If any of these conditions
are present in the caliper bore or housing, replace the caliper assembly.

If light rust or light corrosion are present in the caliper bore, attempt to
remove the imperfection with a fine emery paper. If the imperfection
cannot be removed, replace the caliper assembly.

Clean the brake caliper piston bore and seal counterbore, the caliper
piston and the caliper sleeves with denatured alcohol or equivalent.

Bleed the brake system anytime the system is opened for repairs. Refer
to Hydraulic Brake System Bleeding (Manual) or Hydraulic
Brake System Bleeding (Pressure) .

2007 Hummer H3

2007 BRAKES Disc Brakes - H3

Fig. 19: Brake Caliper Overhaul - Front
Courtesy of GENERAL MOTORS CORP.

Front Brake Caliper Overhaul (with RPO BRM)

Callout

Component Name

CAUTION:

Refer to Bleed Procedure Caution .

CAUTION:

Refer to Brake Dust Caution .

CAUTION:

Refer to Brake Fluid Irritant Caution .

2007 Hummer H3

2007 BRAKES Disc Brakes - H3

Fastener Tightening Specifications: Refer to Fastener Tightening Specifications.

Preliminary Procedure

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

2. Remove the front disc brake caliper. Refer to Front Brake Caliper Replacement.

CAUTION:

Refer to Eye Protection Caution .

NOTE:

Refer to Brake Fluid Effects on Paint and Electrical Components Notice .

NOTE:

Refer to Fastener Notice .

1

Front Brake Bleeder Valve Cap

2

Front Brake Bleeder Valve Screw

Tighten: 10 N.m (89 lb in)

3

Front Disc Brake Caliper Piston Boot (Qty: 4)

4

Front Disc Brake Caliper Piston (Qty: 4)
Tip:

Wear eye protection while performing these steps.

Do not use abrasives to clean the brake caliper piston or the disc brake
caliper bore.

Place a block of wood against the inside of the caliper body, opposite
of the caliper piston, then direct low pressure compressed air through
the caliper inlet port to remove the caliper piston. Repeat for each of
the pistons, until all the pistons are removed from the caliper bores.

During installation apply a thin coat of Delco® Supreme 11 GM P/N
88958860 (Canadian P/N 88901244) or equivalent DOT-4 brake fluid
from a clean, sealed brake fluid container onto the outer surface area of
the caliper pistons.

Front Disc Brake Caliper Piston Seal (Qty: 4)
Tip:

1. Use a small wooden or plastic tool, carefully remove the rear disc

brake caliper piston seal from the groove in the caliper seal bore.

2007 Hummer H3

2007 BRAKES Disc Brakes - H3

REAR BRAKE CALIPER OVERHAUL

Fig. 20: Brake Caliper Overhaul - Rear

5

2. During installation lubricate the new piston seals with Delco®

Supreme 11 GM P/N 88958860 (Canadian P/N 88901244) or
equivalent DOT-4 brake fluid from a clean, sealed brake fluid
container.

6

Front Disc Brake Caliper
Tip:

Inspect the caliper bore and housing for cracks, scoring, pitting,
excessive rust, and/or excessive corrosion. If any of these conditions
are present in the caliper bore or housing, replace the caliper assembly.

If light rust or light corrosion are present in the caliper bore, attempt to
remove the imperfection with a fine emery paper. If the imperfection
cannot be removed, replace the caliper assembly.

Clean the brake caliper piston bore and seal counterbore, the caliper
piston and the caliper sleeves with denatured alcohol or equivalent.

Bleed the brake system anytime the system is opened for repairs. Refer
to Hydraulic Brake System Bleeding (Manual) or Hydraulic
Brake System Bleeding (Pressure) .

2007 Hummer H3

2007 BRAKES Disc Brakes - H3