Silhouette V6-191 3.1L VIN D TBI (1995)
Hydraulic Control Assembly - Antilock Brakes: Service and Repair
ABS Hydraulic Modulator Gears
Fig. 330 ABS Modulator Gear Removal.
Fig. 331 ABS Modulator Gear Orientation.
WARNING: Do not attempt to repair defective motor packs or modulator assemblies. Modulator drive gear replacement is the only service
that can be performed on these assemblies. The modulator drive gears are under spring load and will turn during disassembly. After
removing hydraulic modulator drive gear cover, do not place fingers into the gear set.
1. Remove ABS hydraulic modulator assembly. Refer to ABS Hydraulic Modulator And Master Cylinder Assembly. See: Hydraulic
Modulator/Master Cylinder Assembly
2. Remove six Torx head screws attaching gear cover.
3. Remove four motor pack to modulator assembly Torx head screws, then separate motor pack assembly from hydraulic modulator assembly.
Use care not to drop or damage motor pack assembly. If motor pack assembly is dropped or damaged during handling, it must be
replaced.
4. Turn modulator gear to position piston in the center of its travel.
5. Place a screwdriver through the holes in gears into recessed hole in the modulator base as shown in Fig. 330.
Do not allow gear to turn while removing retaining nut.
6. Remove three modulator drive gear to modulator driveshaft retaining nuts, then the gears from modulator.
7. Reverse procedure to install, noting the following:
a. Do not allow gears to turn when tightening retaining nuts.
b. Torque retaining nuts to 6 ft. lbs.
c. Rotate each modulator gear counterclockwise until movement stops as shown in Fig. 331, before positioning motor pack assembly onto
hydraulic modulator.
d. Torque motor pack assembly to hydraulic modulator assembly Torx head screws to 40 inch lbs.
e. Torque gear cover Torx screws to 27 inch lbs.
