what is air suspension

Air suspension is a type of vehicle suspension that replaces or supplements a vehicles springs with air-filled bladders that can adjust the ride height and firmness for the drivers comfort. An electric or engine-driven air pump or compressor powers the air suspension system, which pumps air into a flexible bellows made from textile-reinforced rubber. The compressor inflates the bags to a certain pressure to behave like springs, and the bags slip over the shocks, similar to a coil spring. Air suspension is used to provide a smooth, constant ride quality, but in some cases, it is used for sports suspension. Modern electronically controlled systems in automobiles and light trucks almost always feature self-leveling along with raising and lowering functions. Air suspension is also a common suspension upgrade for those who tow or haul heavy loads with their pick-up truck, SUV, van, or car. Air springs, also called "air helper springs," are placed on existing suspension components on the rear or front of the vehicle to increase the load capacity.