The utility model is a camshaft for automobile braking, which mainly includes a cam and a shaft, the cam and the shaft are connected, and the cam and the shaft are concentric. Circle involute. The cam is at the end of the shaft. In the vehicle braking camshaft obtained by the utility model, the cam is concentric with the shaft, the longitudinal section of the cam is a center-symmetric S-shape, and the two outer arcs of the S-shape are involute curves at the center of the concentric cam and the vehicle's camshaft. The braking system is better matched, the transmission force is more uniform during the transmission process, and the friction coefficient is small, thereby reducing the wear during use, prolonging the service life, and reducing the maintenance cost; on the one hand, the transmission effect is better, when the transmission torque is large. Can effectively meet the demand, the actual effect is better.