There is a minimum thickness that they can not go below. The minimum thickness should be stamped on the rotor and you will need a micrometer to measure them. Also, if the rotors are badly grooved or warped, chances are they will need replaced.
If you explaine your concerns, I may be better able to help.
Let me know.
Joe
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Saturday, January 2nd, 2010 AT 12:43 AM