1,BPW standard brake scam shaft.spring camshaft. 2,American and york type. 3, ... for trucks, semi-trailers.Spring scam shaft and brake camshaft. 1,Supply kingpin camshafts for trucks, semi-trailers ... .2,produce Brake drum, Brake shoe and other spare parts.3,BPW ... concentric degree within 0.02MM strictly. 4.HJ brake lining is high performance, non-asbestos, non-pollution ...