My 95 was sitting outside for the last few months until I had a chance to get to a few things. As usual when sitting outside the rotors rusted up a bit. I had just put new pads and rotors on the car all around last fall when I rebuilt the front suspension and put a new oil pan on. I started driving the car and it had the warped rotor feel when you hit the brakes, pretty bad too.
Last night I got out the porter cable DA with some 80 grit pads. I took the front rotors off and cleaned them up a bit. I could see where the pad material transferred to the rotors in the rusty areas. After a few minutes of sanding on each side of the front rotors it I put everything back together. The wobble is completely gone now, it seems like it was just a transfer of pad material. I still have a little pulsing in the pedal but that is likely from the rear rotors since I didn't touch those yet.
So before replacing rotors, if you aren't able to get them turned it might be worth a shot to hit them with some sandpaper. Just be careful to sand them as evenly as possible. It's also worth saying that these rotors were otherwise in great shape, no grooves or amount of wear, just some rust from sitting.
Last night I got out the porter cable DA with some 80 grit pads. I took the front rotors off and cleaned them up a bit. I could see where the pad material transferred to the rotors in the rusty areas. After a few minutes of sanding on each side of the front rotors it I put everything back together. The wobble is completely gone now, it seems like it was just a transfer of pad material. I still have a little pulsing in the pedal but that is likely from the rear rotors since I didn't touch those yet.
So before replacing rotors, if you aren't able to get them turned it might be worth a shot to hit them with some sandpaper. Just be careful to sand them as evenly as possible. It's also worth saying that these rotors were otherwise in great shape, no grooves or amount of wear, just some rust from sitting.