Last week I replaced all my rotors and pads and flushed the fluid from the brakes, everything went fine no probs, simple task...but I have found that my rear rotors are warped to the point that they contact the pads and squeek when rolling away from a cold start. Once the brakes are used the squeek goes away of course because its getting the brakes warm etc.. I did not use a torque wrench to put the wheels back on just a the Beetles lug bolt wrench, could I have warped them from overtightening?? I'm always trying to understand how a rotor can be warped from tightening lug bolts when the rotors mating surface is higher from the braking surface??? Advice please, do the rotors need to go in the garbage or is machining an option, they are all new oem from VW. Will loosening them release tension and allow them to be straighter or are they set up in this warped state permanently. Thanks all for any info.