... semi-trailer fiftting located in Liangshan,Shandong province. Brack Drum Liangshan Darong Traffic Mechinery co.,ltd. is a professional ... pendel axle series,spoke axle series,outboard/inboard drum axle series for international markets.We are developing and expanding gradually ... assembly, the single point suspension systems, outboard/inboard drum axle assembly ,spoke axle assembly and other special car ...