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Old 03-03-2012, 02:27 PM
TRS550 TRS550 is offline
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Location: Ohio
Join Date: Jan 2010
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Mein Auto: 2007 550i
Originally Posted by hedshrnk View Post
It is a very common error people make in putting a dial indicator on a rotor and assuming the errant reading indicates a "warped rotor". What you are seeing is uneven rotor wear due to worn or damaged pads, not warpage. There are literally dozens of sources available online which discuss the myth of the "warped rotor". Please note, I am not saying it is impossible for a rotor to warp, just unlikely in the extreme.

A much more likely cause would be failed thrust arm bushings, as posted by others.
That wasn't the cause on my car. The OP doesn't state the milage on his car. If his car is a high milage car, the yes, thrust bearings could be the issue. However, the OP stated once the rotors were replaced, the problem went away for 2 months in each case, making the thrust bearing diagnosis incorrect.
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