MAD Air Helper kits consist of air-bags which can be fitted either between the axle and the chassis or where space permits inserted inside the original coil-spring. Inflation is carried out either from a garage tyre-inflator or portable compressor via a fill-valve. Alternatively an on-board compressor can be fitted and operated from the driverï¾’s seat to increase or decrease pressure to obtain the most comfortable and best ride height dependant on the load in the vehicle.