For late model performance vehicles, Wilwood AERO4 Big Brake Kit replaces factory disc brakes and uses OE parking brake assemblies. Each kit contains AERO4 calipers, large diameter rotors, and BP-10 or BP-20 compound pads that are designed to work with specific OE master cylinder outputs, ABS function, and vehicle bias requirements, depending on the vehicle. The AERO4 big brake kit combines improved brake performance and durability with significant wheel, tire, and suspension upgrades. We have the largest selection of bolt-on brake kits available, each consisting of a group of components that have been specifically engineered and matched to provide superior brake system performance and custom appeal across a broad range of applications. Most kits can be installed with standard brake tools.