2500 4x4 Pickup V8-318 5.2L Magnum (1995)
Hydraulic Control Assembly - Antilock Brakes: Description and Operation
Rear Antilock Valve Circuit Operation
With Four Wheel Antilock Brakes
Circuit B120 from the ABS power relay supplies voltage for the isolation and dump solenoids in the rear anti-lock valve. The ABS control module
activates the solenoids by providing separate ground paths for each.
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Circuit B254 connects to cavity 26 of the ABS control module and provides ground for the right rear dump solenoid.
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Circuit B252 connects to cavity 28 of the ABS control module and provides ground for the right rear isolation solenoid.
The rear anti-lock valve has one reset switch that provides an input to the ABS control module. Circuit B19 from the reset switch connects to ABS
control module cavity 19.
With Rear Wheel Antilock Brakes
The rear anti-lock valve contains an isolation sole. noid, a dump solenoid and a reset switch. Each is powered by the Rear Wheel Anti-Lock
(RWAL) module on separate circuits.
Circuit B108 from cavity 14 of the RWAL module feeds the dump solenoid. The isolation solenoid is powered on circuit B101 from cavity 1 of the
RWAL module. Circuit Z9 provides ground for both solenoids. Circuit Z9 terminates in the engine compartment at the left fender side shield.
Circuit B111 from cavity 11 of the RWAL module connects to the reset switch. The case grounded rear anti-lock valve provides ground for the reset
switch.
