The six pack for air manifold for the front axle contains six solenoids, four of these are for the leveling system when parked: left front raise, left front lower, right front raise, right front lower, The two remaining solenoids control the travel height (raise and lower). The drive axle six pack and the tag axle six pack are similar to the front axle six pack.
The travel solenoids are controlled by the three ride height valves, center of front axle, right side of drive axle and left side of drive axle. The leveling solenoids are controlled by the level sensor, typically located in the center of the bay, near the center of the coach mounted to the ceiling of the bay.
Each six pack has a single air supply line going into it and air lines that go to the corresponding air bags and to an air release valve.
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