Wilwood 140-14263 Wilwood AERO4 / MC4 Rear Kit 14.00 Currie Pro-Tour Unit Bearing FloaterWilwood 140 14263 Wilwood AERO4 MC4 Rear Kit 14. 00 Currie Pro Tour Unit Bearing Floater AERO4 Big Brake Rear Axle Kits replace the factory disc brakes and use the OE parking brake assembly as a compliment to front big brake upgrades on late model high performance vehicles. High capacity braking from the W4AR calipers, BP 10 compound pads, and oversized 14. 00" rotors are matched to the OE master cylinder output, ABS function, and individual vehicle