The S Brake camshaft mainly comprises a CAM and a shaft rod, the CAM is connected with the shaft rod, characterized by the concentric CAM and the shaft rod, the longitudinal section of the CAM is centered symmetric S-shaped, and the S-shaped two outer arcs are the center of the CAM concentric circle involute.The CAM is located at the end of the shaft rod.Thus, it has a good matching with the automobile brake braking system, and the transmission power is more uniform in the transmission process, and the friction coefficient is small, so as to reduce the wear and tear in the use process, prolong the service life and reduce the maintenance cost.On the other hand, S-type camshaft transmission effect is better, can effectively meet the needs of larger transmission torque, the practical effect is better.