... all the time. 1,Air chamber: single and double brake chamber. 2, pole long:207 and 255mm. 3, Special order can according to ... , high rotate speed, good intensity, abrade resistant and heat resistant.7.HJ wheel hub and brake drum use the international standard material of ... ,Supply various camshafts for trucks, semi-trailer parts.2,produce Brake drum, Brake shoe and other spare parts.3,BPW standard. T-30 ...