Leaf Spring, Trailer Axle, Trailer Suspension manufacturer / supplier in China, offering Durable 2.5′′ (64mm) Stroke Sealed 30/30 Air Brake Chambers for Trucks, 3"/76mm T3030 Long Stroke Complete Spring Brake Chamber for Heavy Trailers, T30/30 Spring Brake Chamber 3" Long Stroke & Service Brake Chamber and so on.