B250 3/4 Ton Van V8-318 5.2L VIN T FI (1992)
Hydraulic Control Assembly - Antilock Brakes: Description and Operation
RWAL Hydraulic Valve
Fig 1 RWAL Connector Locations
PURPOSE
The hydraulic valve modulates hydraulic pressure and is controlled by the electronic module. The valve controls fluid pressure to the rear brake
units during anti-lock mode braking.
OPERATION
The valve contains an accumulator, an isolation valve and a dump valve.
The accumulator is operated by fluid and spring pressure. The two valves are operated by electrical solenoids that are activated by the anti-lock
control module.
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During normal braking, the valve components are inactive allowing free flow of brake fluid to the rear brake units.
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In anti-lock mode, the valve will decrease, hold or increase fluid apply pressure as needed.
The valve is mounted on the driver side frame rail at the rear of the vehicle.
