Skylark V6-3100 3.1L VIN M SFI (1996)
Hydraulic Control Assembly - Antilock Brakes: Service and Repair
Gear Replacement
CAUTION: To help avoid personal injury, due to a retained load on the ABS hydraulic modulator, the gear tension relief function of the Tech
1 must be performed prior to removal of the ABS hydraulic modulator/master cylinder assembly. Refer to "Gear Tension Relief Sequence".
NOTICE: Complete overhaul of the hydraulic modulator/master cylinder assembly is not authorized, only the following steps. These steps will break the
unit down into major components for replacement purposes.
GEAR REPLACEMENT
Gear Removal
Gear Positioning
IMPORTANT: Do not attempt to repair damaged motor packs or hydraulic modulators. Other than modulator drive gear replacement, repair of these
assemblies is not authorized. Do not lubricate or oil gears or motor pack.
CAUTION: The modulator drive gears are under spring load and will turn during disassembly. After removing hydraulic modulator drive gear
cover, exercise extreme care not to place fingers into the gear set, since fingers can be pinched by rotating gears.
DISASSEMBLE
1. Hydraulic modulator/master cylinder assembly.
2. Torx head screws attaching gear cover.
3. Four motor pack to hydraulic modulator Torx head screws.
IMPORTANT: Take care in handling the motor pack. If dropped or damaged in the handling, the motor pack must be replaced.
4. Separate motor pack from hydraulic modulator.
NOTICE: Do not allow gear to turn while removing the retaining nut, since the modulator piston can hit the top of the modulator bore, damaging the
piston. Turn the modulator gear to position the piston in the center of its travel. Place a screwdriver through the holes in the gears (not between the gears)
into the recessed hole in the modulator base. This will prevent the gear from turning, aiding in gear removal.
5. Three modulator drive gear to modulator drive shaft retaining nuts.
6. Gears from modulator.
