Air Supply Unit
As on vehicles with single axle air suspension, the air supply unit is located in the luggage compartment under the spare wheel. As with the single axle air suspension, the auxiliary tanks for the rear air spring bellows are located in the luggage compartment.
The air supply unit is configured similarly to the single axle air supply unit for the ride-height control system of the E39, which is currently in production.
The functions are implemented by activating a compressor and various valves in the air supply unit and on the air accumulator valve unit.
The maximum pressure of the air supply unit is 21 bar.