Once you're satisfied with the rotor runout, the calipers go on next.The SSBC calipers may require shimming to center the caliperside-to-side over the rotor. This is important for even disc-pad wear.Also, improper shimming can bind the caliper pistons. We found thatstarting the caliper mounting bolt opposite the side that requires theshims makes shim installation easier. Here, the lower mounting point ofthe driver-side front caliper needed shims. We used the K&S Brass Shimmaterial PN 250 (.005X4X10) from Ace Hardware.