Wilwood 140-16026 Wilwood Aerolite 4R Rear Kit 15.00in Black 13-17 Dodge Truck 1500 - 4WDWilwood 140 16026 Wilwood Aerolite 4R Rear Kit 15. 00in Black 13 17 Dodge Truck 1500 4WD 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 trucks and SUVs. High capacity braking from the AERO4 calipers, BP 10 or BP 20 compound pads, and oversized rotors are matched to the OE master cylinder output, ABS function, and individual vehicle bias