Electro Hydraulic drum brakes are widely applied in hoistiong,transportation,metallurgy,mines,ports,docks,civil construction as brake gears for deceleration or stop of driver units of various machines. The installation of brake linings and brake shoes adopts insertion method which is safe and reliable and is simple and quick for replacement.Brake linings of various kinds of materials such as asbestos free,dsbestos are available for the customers. Some additiomal functions can be realized by adding special deveces: .Manual release debice .Released or closed limit switch can indicate the signal of shether the brake is normally released .YWZ4B,YWA8,YWZ13 series brakes can realize delayed release or close driven by Ed series thrusters with time delay valves. .YWZ13 can be added with brake linings automatic wear compensation device,which can realize stepless automatic compensation for shoe clearance and brake torque when the brake linings are worn,Meanwhile,it can be added with wear approach swith for brake linings which can indicate the signal when the brake linings wear to the wxtreme value.