I changed out my front rotors and brake pads yesterday. Living in the rust belt is tough on Jeeps especially the rotors that get stuck on because of rust. I tried using penetrating oil on the rusted on rotor but no luck. After siting overnight I tried again removing the rotor and no luck I found this mechanics helper on a Jeep Commander forum. I mixed 50/50 ATF (transmission fluid) and acetone (finger nail polish remover) and gave it a soak around the base of the lug studs and waited a few minutes and repeated. Two light taps on the back of the rotors with a 5lb. sledge hammer was all that was needed to pop the rotor loose. Be careful not to get the mix on paint as it will ruin it. I hope this helps out the next person with rusted on rotors.