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					Originally Posted by Racer Boy  That's interesting. I wonder what the differences are in why they worked for you, but not me? I tried new rotors, and that made no difference. I also bedded them in according to EBC's directions. 
 In fact, I've tried green, red, and yellow EBCs; green faded easily (no surprise), and both reds and yellow gave me the shuddering. That's why I'm going to try something else.
 
 
 Anyone here had experience with the Porterfield RS4s?
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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.