Service braking system for coal mine underground rubber-tired vehicle

The utility model discloses a service braking system for a coal mine underground rubber-tired vehicle. Power output of a flameproof diesel engine is connected with power input of an air compressor pump; an intake pipe of the air compressor pump is connected with a purified air pipe; an exhaust pipeline of the air compressor pump is connected with a gas three-way pipe joint; other two connections of the gas three-way pipe joint are connected with two gas storage cylinders, respectively; gas storage cylinder one-way valves are disposed on intake pipelines of the gas storage cylinders, respectively; exhaust pipelines of the gas storage cylinders are connected inlets of a pneumatic brake master valve, respectively; exhaust pipelines of the pneumatic brake master valve are connected with two air booster pumps; output ends of the air booster pumps are connected with a connection of a hydraulic three-way pipe joint I and a connection of a hydraulic three-way pipe joint II through hydraulic pipelines, respectively; o