... the drum brakes have a compensation device and brake cylinder. The drum brake is used for automobile crane QY12T, QY16T, QY20T, QY25T ... , QY30T, QY50T and QY75T, etc., big tonnage cargo truck, pavers, graders, road ... are more than 20 kinds of products for you to choose. Disc Brake SOMA Diameter 75x 4 for cranes, dump truck and compactors