Cylinders: 4 & 2 Size of Cylinders: 75mm & 54mm Rated Pressure: below 16Mpa or 12Mpa,Brake Moment: 1075Kgfm or 1044Kgfm. Some of 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 rollers and excavators and so on. Both the brake shoe and ...