Left. Right. A bolt used to mount / lock the disc brake caliper to the disc brake caliper guide pin. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Parking Brake Motor to it's mounting point. Power Operated Parking Brake. mount. Actuator. Disc Brake Guide Pin. Disc Brake Slide Pin. Parking Brake Motor.