Hummer H1 Service Manual page 448

_____________________________________________________________
®
PRESSURE TANK BLEEDER ADAPTER
MASTER CYLINDER
PRESSURE TANK
Figure 7-4: Pressure Bleeding Brake System
Manual Bleeding
NOTE: This procedure covers bleeding at one wheel. Repeat
bleeding task for remaining wheels. Assistance is required to
depress the brake pedal when manually bleeding brakes while
mechanic opens and closes bleeder screw.
NOTE: Bleed calipers in the following order: right rear, left
rear, right front, left front.
1. Disconnect batteries.
2. Remove protective cap from bleeder screw on caliper
assembly (Figure 7-5).
3. Connect short piece of hose to bleeder screw, and place
other end of hose in container 3/4 full of brake fluid.
CAUTION: Check the master cylinder fluid level frequently
during the bleeding operation and refill the reservoirs as nec-
essary. Do not allow the master cylinder to run out of fluid at
any time, or additional air will be drawn into the system.
4. Have an assistant depress the brake pedal. Open bleeder
screw 3/4 turn.
05745159
BLEEDER SCREW
PROTECTIVE
CAP
VALVE
Figure 7-5: Manually Bleeding Brake System
5. When pedal reaches floor, tighten bleeder screw and have
assistant slowly release brake pedal.
6. Repeat steps 3 and 4 until fluid flows clear and free of air
bubbles.
7. Disconnect hose from bleeder screw and install protective
cap on bleeder screw.
8. Connect batteries.
9. Operate vehicle and check brakes for proper operation.
SERVICE BRAKE PAD REPLACEMENT
NOTE: The following procedure applies to the front brake
system only.
Removal
1. Using crowfoot, remove two capscrews and washers
securing yoke and caliper to adapter.
NOTE: Note positioning of brake pad surfaces for installation.
2. Remove yoke, caliper, and two brake pads.
Cleaning and Inspection
NOTE: Clean all components, examine for wear or damage,
and replace if necessary.
Brake System
HOSE
7-9
CALIPER
ASSEMBLY