1,Supply truck trailer spring air double brake chamber. 2,Single ... for trucks, semi-trailers. 1,Supply truck trailer spring air double brake chamber. 2,Single chamber and double ... 1. HJ bogie&trailer axle beam, which has the advantages of small, high intensity, over loading capability and not ... , can protect bearing well. 6.HJ bearing is over loading capability, high rotate speed, good intensity, abrade ...