1,Air chamber:single and double brake chamber. 2, pole long:207 and 255mm 3, Special order can according to customer request. We can supply various bouble air brake chamber for trucks, semi-trailers.Produce brake parts similar like brake drum,brake lining,brake air chamber,slack adjust, adjuster arm,kingpin, fifth wheel.We supply the brake parts according to BPW standard.We also made the BPW ...