rear caliper

Replacing the rear rotors and calipers on our Milano.Are there any tricks or problems we should know ??:confused:

hey guys, I'm rebuilding my driver's side rear caliper and the kit comes with the dust boots, the piston seals and two small o-rings. I've identified the smaller of the o-rings as going on the adjustment screw for the outboard side, but I'm at a loss for what the other one is for. I called...