In an adaptive suspension system, the air suspension maintains the vehicle at a constant level on both axles independently of its load state. Four height sensors continuously detect the distance between the axles and the body. If the control unit determines a variation from the specified distance, it activates a compressor which balances the pressure in the spring elements by way of solenoid valves such that the specified default position is regained within fractions of a second. Adaptive suspension boosts driving safety and ride comfort by preventing the vehicle's rear end from dropping when laden. The speed-sensitive adjustment to different vehicle levels helps to save fuel and improves handling and performance. Cornering stability is also improved by means of differential locks in the springs of an axle.