Did you get the right size rotors? On the 91 there are two different sized hubs--one is thicker than the other--Also using autmatic hubs or manual?
remove the brake caliper and the rotors come right off
Hire a mechanic!
Possible that the rear sensors are broken.
It could be that the brake pads are dragging on the rotors.
tools you need for job
The brake rotors only need to be changed if they are worn beyond allowable specifications and should be changed in pairs. They do not need to be changed with the pads unless they are damaged as above or warped.
Warped brake rotors........
When rotors need to be changed usually the pads have worn down. It is always a good idea to change pads when changing rotors.
you have remove the whole locking huh?
warped rotors change them and it should be fine
It is necessary to state whether it is a 4X4 or a 4X2
Rear rotors should last 100,000 miles easily!! change your brake shoes at around 45-50,000 miles