I had pretty bad steering judder under braking last year and it turned out to be worn, gummed up rotors from insufficient cool down after a track session. I replaced my pads and rotors and added 997 GT3 cooling ducts. So far, so good. Not properly bedding your brake pads can also cause brake judder by not getting an even coating of pad material on the rotors.
Is this a track car or daily driver? What pads are on the front?
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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