Air Suspension

A compressor, valve block, air reservoir and height sensors control the pressure in each spring. The car can raise or lower itself, for example for motorway driving, rough roads or easier loading. It is common on luxury cars, large SUVs, vans and trucks, often combined with adaptive dampers.

Adding air raises the spring and the car; releasing air lowers it, while height sensors keep the level correct regardless of load.

Leaking air springs or lines make one corner sag, often after standing overnight, and overwork the compressor. The vehicle must be put in a jacking or workshop mode before lifting, otherwise the system may try to level and cause damage or injury.