Well I looked at where the cable meets the rear brakes on both sides. They're not rusted. Other parts of the cables however have rust poking out from under the jackets. I sprayed good ol wd 40 on it and wire brushed the hell out of the parts, but it stil didn't work. I know now that at least one of the cables is rusted to the inside of the jacket. Now I just have to have a fun time finding the little jerk of a cable.