How do you adjust ride height on freightliner low air leaf suspensions?

adjustment for airliner suspension

with measure tape you can adjust the freightliner airliner suspension from 2 3/8 - 2 7/8 you measure on front axle of rear drivers .driver side from between bottom of axle land and on top of u bolt where it go over axle.procedure too adjustment is too measure it with trailer off tractor 0 weight settn on 5th wheel,if you haul heavy alot the 2 7/8 adjustment or you can go up too 3 in but 3 in is pretty stiff rideing.ok so get air built up till tanks full shut truck off realease brakes and block wheels to adjust height loosen off two nut on valve adjust and measure height tighten bolts and your done but you can start truck set brake air up tanks and dump air bags on drives all the way down then air back up and measure height again always measure same place driver side front axle.if it measure same as when you tightened nuts back up you did it right.