Abs Modulator Replacement - Hummer H1 Service Manual

7-48 Brake System

ABS MODULATOR REPLACEMENT

Removal
WARNING: Batteries must be disconnected when the
brake hydraulic system is being serviced and bled. If the
ABS motor pump runs when air is in the hydraulic sys-
tem, air can get trapped behind the valves in the modu-
lator causing a spongy brake pedal.
1. Disconnect the batteries.
2. Remove the left front splash shield.
3. Remove the horn bracket and horns (Figure 7-53).
Figure 7-53: Brake Line And Wire Connections
4. Remove the thirteen-pin, the two-pin and the one-pin wire
connectors from the modulator assembly.
5. Remove the master cylinder brake hoses at the modulator
and cap off (note the position of the lines in the modulator
for installation).
6. Remove the four wheel brake lines from the modulator
and cap off (note the position of the lines in the modulator
for installation).
7. Remove the "P" clamp securing the oil cooler lines to the
modulator mounting bracket.
_____________________________________________________________
1 AND
13-PIN
CONNECTORS
2-PIN
PUMP
CONNECTOR
9-S07-011
8. Remove the four bolts, washers and lock washers securing
the modulator bracket to the air lift bracket (Figure 7-54).
AIR
LIFT
BRACKET
Figure 7-54: Modulator and Bracket Assembly-
Mounting
9. Remove the modulator, mounting bracket and shield from
the vehicle.
10. Remove the motor pump wire connector from the
modulator bracket and the two bolts securing the
modulator to the bracket.
MODULATOR
ALIGNMENT
PIN
MOUNTING
BRACKET
9-S07-012
Figure 7-55: Modulator Mounting
®
9-S07-010