I just changed the rear brakes on my 02 Passat, the rotor needed to be changed as well but couldn't find it in stock anywhere and needed to be able to drive it so I just changed the pads (I know I'll neeed to go back and redo the job). The question is that I still hear a rubbing sound as if the pads are resting on the rotor when I drive. Is this normal for a while? I used the right tool to turn back the piston. Could it be because the rotor is scarred?