The S-brake camshaft includes a cam, a transmission shaft and a flange opened on the transmission shaft. An integrally manufactured mounting seat is installed on the cam, and the transmission shaft is welded and connected to the mounting seat; the end of the transmission shaft away from the cam is provided with a groove, and a viewpoint sensor is fixedly installed inside the groove; a threaded groove is provided on the transmission shaft around the groove, and a positioning part is installed on the transmission shaft through threaded connection, and the positioning part is provided with a threaded connection that matches the threaded groove. A wireless transmission device is installed in the positioning part, and the wireless transmission device is connected to the viewpoint sensor through the internal circuit ; 2 support grooves are also provided on the drive shaft.

The S-brake camshaft can increase the welding area between the drive shaft and the mounting seat through the welding groove, so that the welding place between the drive shaft and the cam is more firm; the sensor can sense the change of the viewpoint when the S-brake camshaft rotates, and then The viewpoint information is sent to the car processor through the connected wireless transmission device, which realizes the real-time monitoring of the S-brake camshaft.