How do you remove the disc for turning on a 4 wheel drive Nissan Pathfiner circa 1995?

Did the pads cut into the rotor? Are the rotors warped? If that's the case, it will have to be replaced. If not, don't worry about having them turned; just put in new pads and run with it. A lot of companies are now advising against turning the rotors. And I never have. If they are out of specs, I just throw them away and get new ones.