We greased the spindle, lubed the bearings, and slid on the entire Wilwood 13-inch brake assembly. The rotors are slotted and cross-drilled to allow heat to escape and ensure minimal to zero brake fade on the road course. Once on, the castle nut and locking pin install next, followed by the Wilwood hubcap. The four-piston caliper and brake pads mount using the supplied bracket. We had to use a small shim on both bolts to center the caliber between the brake pads.