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					Originally Posted by Topless  FWIW, rotor judder is generally from uneven hot pad transfer to the rotors.  This is usually caused by failing to take a nice easy cool down lap or an easy drive down paddock row to cool the rotors down before stopping the car.  I had this problem with Pagid Yellows and it got really bad but in hindsight, it was probably my cool down habits, not the pads fault.  I cool down for at least 2 miles now and have never had another problem.
 The best high heat pads I have used are Raybestos ST-43 custom cut from Porterfield.  Excellent modulation, heat management, and they last 20+ track days.  I have run these pads for about 7 years now and love them.  Downside:  They squeal like a school bus when cold.
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Judder can also occur when you have two incompatible brake compounds on the same rotor.   Ceramic and metallic compounds don't mix well and some metallics don't work well together either.