Level Control Solenoid Valve: Description and Operation

FRONT FILL SOLENOID
The front fill solenoid connects the output of the compressor assembly to the two front air springs. When energized, air pressure to the front axle can be modified, affecting its height relative to the body. The front fill solenoid is also used to bleed the front air springs of compressed air.

REAR FILL SOLENOID
The rear fill solenoid connects the output of the compressor assembly to the two rear air springs. When energized along with the rear gate solenoid, air pressure to the rear air springs can be modified, affecting axle height relative to the body.

REAR GATE SOLENOID
The rear gate solenoid provides pneumatic isolation of the left and right sides of the vehicle. The separation is necessary to eliminate the transfer of air from left to right rear air shocks during turning. When the solenoid is off (closed), the left and right rear air springs are separated, allowing a pressure differential to be generated. In a turn, the increased pressure in the two outermost air springs raises the two outer wheel spring rates, decreasing vehicle roll.