1,Supply brake drum for truck,semi-trailer. 2,produce Brake ... trucks,semi-trailers.Produce brake parts similar like brake drum,brake lining,brake air chamber,slack adjust, adjuster arm ... and heat resistant.7.HJ wheel hub and brake drum use the international standard material of ball iron and ... camshafts for trucks, semi-trailer parts.2,produce Brake drum, Brake shoe and other spare parts.3,BPW standard. ...