The Eliminator Trailer Disc Brake features an integral one-piece style vented rotor with automotive quality brake pads. Distinctive 380 aluminum caliper with E-coat finish and raised ribs dissipates heat up to 5 times faster than normal cast iron calipers. Vented rotor with GalvX finish. Galvanized heavy-duty mounting bracket included. Dual brass bleeder valves. Stainless steel guide pins. Bi-metal piston with stainless steel piston cup. Two kits required per axle.