Safe and reliable control of the brake can be realized with the rotary arm driven vehicles and equipment, to have a positive and the speed protection requirements of the winch, the positioning of the anti slide of accurate control of hydraulic motor. Parking brake on the built-in spring brake, to release the brake, closed by hydraulic oil. When the operator cut oil pressure, or due to accidental oil pressure under the condition of removing, brake will produce maximum torque and achieve the best braking effect. Multi-disc brake design is widely used in construction, material handling, agriculture, mining, environmental health, the utility of heavy machinery and timber industry and the vehicles on the road. They are also suitable for the application of winch. This type of brake to prevent causing brake pads