2. Next we removed the caliper slider bolts, lifted off the caliper, and slid off the rotor. The axle nut was already off, but there are three 12-point 13mm head bolts that hold the unit bearing on. Unscrew these, and remove the unit bearing. Unfortunately, to install the new rotors, the unit bearing will have to be shaved around 0.060 to fit the rotors on. We drove ours to a local machine shop and put them on a lathe to take them down the correct amount.