Spring energy storage composite brake chamber consists of two sets of relatively independent chamber combination. Front brake chamber air chamber and a general structure and function are the same, is the execution of the braking system device, the input air pressure can be converted into mechanical energy to the wheel brake. Back-end an air chamber air chamber structure is different with general one more powerful spring, when the air chamber does not work, the effects of spring by the input of compressed air in the chamber in the compressed position, will spring the potential energy stored in case of emergency. When the vehicle brake system or vehicle gas circuit failure, energy storage spring air chamber pressure quickly reduce (also can be deflated by control valve), spring is about to release its stored energy, through the catheter to promote front chamber of piston push rod, brake braking effect, make the car to slow down or stop.