Introduced as an improvement on the traditional steel suspension of luxury cars, air suspension is a feature that allows drivers to adjust the quality of the drive according to the nature of the surface on which they are driving. It relies on air pressure inflating the bellows in the suspension system to ensure that the chassis is sufficiently raised above the axle to mask significant bumps in the road. Due to the advanced technology involved, air suspension systems are more technical to fix, so it is recommended that a mechanic is consulted if your system is showing signs of failure. One tell-tale sign is that the vehicle appears to lean to one side when you are driving.