Abstract: A brake actuator having a switch device mounted to an actuator housing with a C-shaped molded body and a C-shaped spring member partially surrounding an actuator rod and adapted to contact a large diameter section of the actuator rod when brake wear causes the actuator rod to travel to a service limit position. In normal operation the spring member is separated from a small diameter section of the actuator rod. The switch device is mounted at an open end of the molded body and spring member and comprises first and second electrical contacts which extend and electrically contact each other as long as the brake actuator rod has not traveled to the service limit. When the push rod ahs traveled to its service limit, a large diameter portion of the push rod forces the contacts apart thus opening the electric circuit.