Improved travelling comfort for level control if single-sided load for older vehicles. Larger spring stiffness. Manually external air supply. Manually level control 2-cycle system will be provided on desired level by external air supply with compressor or at the gas station. Bellows on the left or right can be supplied independently with the necessary air pressure. Lift - function change of the ride height and the angle of driving slope by compressor or at the gas station. Lifting possible for easier load and unload around max. 5 cm. Only possible in passive state. In vehicle operation the pressure must be adapted in regardsto the spring system comfort according to specifications. Easyness of service, maintenance-free air suspension, area wide net of service.