Hummer H2. Manual — part 800
Fig. 37: Removing/Installing Master Cylinder Fluid Level Sensor
Courtesy of GENERAL MOTORS CORP.
MASTER CYLINDER RESERVOIR
CAUTION: Brake fluid may irritate eyes and skin. In case of contact, take the
2004 Hummer H2
2003-04 BRAKES Disc - Hummer
Removal
1. Apply the park brake and block the wheels. Remove the master cylinder. See MASTER CYLINDER .
Drain the master cylinder reservoir.
2. Secure the master cylinder in a vise. DO NOT clamp the master cylinder body, secure only at the flange.
Remove the brake fluid level sensor by carefully depressing the retaining tabs and pushing the sensor
through the reservoir.
3. Carefully remove the reservoir retaining pins. Remove the reservoir from the master cylinder by pulling
the reservoir straight up and away from the cylinder. See Fig. 38 . Remove the seals from the master
cylinder.
following actions: Eye contact; rinse thoroughly with water. Skin contact;
wash with soap and water. If ingested; consult a physician immediately.
NOTE:
Avoid spilling brake fluid onto painted surfaces, electrical connections, wiring,
or cables. Brake fluid will damage painted surfaces and cause corrosion to
electrical components. If any brake fluid comes in contact with painted
surfaces, immediately flush the area with water. If any brake fluid comes in
contact with electrical connections, wiring, or cables, use a clean shop cloth to
wipe away the fluid.
2004 Hummer H2
2003-04 BRAKES Disc - Hummer
2004 Hummer H2
2003-04 BRAKES Disc - Hummer
Fig. 38: Removing & Installing Master Cylinder Reservoir
Courtesy of GENERAL MOTORS CORP.
Installation
1. Inspect the reservoir for cracks or deformation. If found, replace the reservoir. Clean the reservoir with
denatured alcohol, or equivalent. Dry the reservoir with non-lubricated, filtered air.
2. Lubricate the NEW seals and the outer surface area of the reservoir-to-housing barrels with Delco
Supreme 11(R) (GM P/N 12377967) or equivalent DOT-3 brake fluid, from a clean, sealed brake fluid
container. Install the lubricated seals, make sure they are fully seated.
3. Install the reservoir to the master cylinder by pressing the reservoir straight down on the master cylinder
until the pin holes are aligned. See Fig. 38 . Carefully install the reservoir retaining pins to secure the
reservoir. Place the brake fluid level sensor into the reservoir, press into place to secure the sensor
retaining tabs. Remove the master cylinder from the vice.
4. Install the master cylinder. See MASTER CYLINDER . Release the park brake. Bleed the hydraulic
brake system. See BLEEDING BRAKE SYSTEM .
STOP LIGHT SWITCH
Removal & Installation
Disconnect the electrical connector from the stop light switch. Remove the pushrod retaining clip. Remove the
stop light switch. Install the stop light switch. Install the pushrod retaining clip. Connect the electrical connector
to the stop light switch. See Fig. 39 .
2004 Hummer H2
2003-04 BRAKES Disc - Hummer
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