... various bouble air brake chamber for trucks, semi-trailers.Produce brake parts similar like brake drum,brake lining,brake air chamber,slack adjust, adjuster ... cantilever bogie system all the time. 1,Air chamber: single and double brake chamber. 2, pole long:207 and 255mm. 3 ... for trucks, semi-trailer parts.2,produce Brake drum, Brake shoe and other spare parts.3,BPW standard. T-30 brake air chamber