I got a set of brakes from ebay and when I put them on the caliper wont fit on the rotor. The two metal humps on the caliper bracket is catching the rotor even with the caliper screwed in. So I put the old brakes on cause we were riding the Joccassee Gorges the next day. Well, I went to load the Raptor up and I have no rear brakes. The caliper is not coming out far enough to push the pads to the rotor. Do I have to screw the caliper out? Do they not self adjust?