Audi A4 Parking Brake Motor Left Side - 8K0998281ALOEM Number: 8K0998281A 8K0 998 281 A The parking brake motors are part of the rear caliper assembly and allow you to activate clamping of the brakes from the push of a button. Although it is not utilized often on non manual shifting vehicles, the parking brake is there to stop your vehicles from rolling when parked on an incline. When activated, the parking brake motor closes the rear pads onto the rotors and stopping your vehicle in place.