Patent ID: 6997464

Claim:
A lift axle suspension, comprising: an axle; a first suspension air bag connected to an air suspension system and acting one of directly or indirectly in a downward direction upon the axle; a lever having a first end, a second end, and a selectively positioned fulcrum between the first end and the second end, the first end being linked to the axle; a second lift air bag acting in a downward direction upon the second end of the lever, thereby causing the lever to pivot about the fulcrum such that the first end of the lever which is linked to the axle is raised; means for selectively supplying air to either the first suspension air bag to lower the axle or the second lift air bag to raise the axle; and a regulator to regulate air pressure within the air suspension system, the regulator being set at a pressure level that allows pressure to be increased to lift the suspension to provide clearance and then raise the axle without a load, but releases excess air pressure in order to prevent pressure to be increased to lift the suspension and raise the axle when under load.