Air suspension is a type of vehicle suspension powered by an electric or engine driven air pump or compressor. This compressor pumps the air into a flexible bellows, usually made from textile-reinforced rubber. This in turn inflates the bellows, and raises the chassis from the axle.
Air suspension is often used in place of conventional steel springs, and in heavy vehicle applications such as buses and trucks. The purpose of air suspension is to provide a smooth, constant ride quality, but in some cases is used for sporty suspensions. Modern electronically controlled systems in automobiles and light trucks almost always feature self-leveling along with raising and lowering functions. Although traditionally called air bags or air bellows, the correct term is air spring (although these terms are also used to describe just the rubber bellows element with its end plates).
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