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Old 11-25-2012, 07:21 AM   #3
tomoyer
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Join Date: Aug 2011
Location: Reading, Pennsylvania
Posts: 785
My Ride: 03 325xi, 03 330xi
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Usually only 2 reasons that rotors warp; either the lugs are too tight and not evenly torqued OR you have a brake caliper piston hanging up and creating too much heat on the rotor. A bad wheel bearing can also cause, but usually you will hear them.
Wheel lugs should be put on by hand, hand tightened with a torque wrench.
A caliper piston that is hanging up should show signs of heat discoloration (especially if you have painted the calipers).
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