An MSG Equipment article on common air suspension faults, air spring wear and how an ignored leak can eventually destroy the compressor.
Air suspension lets the driver adjust ride height and keeps the ride comfortable even under heavy load. MSG Equipment describes its repair as restoring the system as closely as possible to factory parameters.
Typical faults include damaged wiring, air leaks, failed valves, compressors or height sensors, and knocking shock absorber hydraulics. Air springs wear out fastest. If a leak is ignored, the compressor runs more often, its protective ring wears and the most expensive component of the system fails as well — which is why the article recommends a specialised, reliable workshop.