Conditions of use: ambient temperature: -40 degrees C degrees C+60. Working pressure: 5-7bar. Main performance and structural features: spring brake, pneumatic release. The whole structure is simple, the volume is small, and the weight is light. No asbestos brake liner, green environmental protection. The brake pad is installed with pressure spring clip type, which is convenient and quick to replace. The adjustment of the brake liner is easy and convenient after wear. A disc diameter of each type of brake can be adjusted by four stage braking force distance. All power sources need not be set separately, and can be connected with the existing air compressor stations. The speed control valve is installed in the gas supply line, and the braking time can be adjusted stepless.