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BMW E39 Air Suspension Spring Rear Right Air Bag 37121094614 Air Suspension Air Suspension is a type of automotive suspension that uses air springs instead of conventional steel springs. Computer-operated vents on the air springs, suspension sensors, and an onboard air compressor allow the system to maintain ride height and vary the suspension's ride characteristics. Air Spring An air spring is a rubber and fabric bladder that holds air pressure to support a load and isolate