Just need to know if I need to remove the bolt in the center of the rotor. I think I don't but need to know for sure. Once I remove the caliper the rotor should just slide off, correct? I know these rotors on the 4x4's are a bit different than the 4x2's. Anything else I should do while i'm at it? Also, is it possible that the inner pads wear faster than the outers?