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Originally Posted by DanRealtor
Warped rotors perhaps?
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Probably not. The diagnosis of "warped rotors" is almost always wrong, since the phenomenon rarely ever occurs. The vast majority of judder compaints are caused by a thickness variation in the rotors, which is the result of an uneven pad transfer layer. Brake judder can usually be avoided (and sometimes cured) by proper bedding. See:
http://www.zeckhausen.com/bedding_in_brakes.htm for instructions. It's worth trying this technique before heading over to the dealer, since it's free and fun.
For those interested in the physics of what is actually going on, the following technical white paper may be of interest:
The "Warped" Brake Disc and Other Myths of the Braking System