Left.W/ALCON BRAKES. Rear. Right.W/ALCON BRAKES. Shield. A Bracket for a disc Brake Caliper. A Shield used to contain the Brake dust produced by the Brake pads of a vehicle's disc Brake Calipers. This typically is Mounted to the vehicle's wheel hub. Additionally, it functions as a splash guard to protect a vehicle's disc Brake rotors from water, dirt and debris. Alcon Brakes. HUB CarRI. plate. Brake Dust. Carrier. Disc Brake. Knuckle. SPLASH GUARD. Support.