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If it happens all the time at speed it is a most likely bad tire or bent wheel. The wheel balance guys should catch that.
If it only happens under braking, it is rotor judder from uneven pad transfer. With a significant lip on your rotors I would measure them for runout and probably change them. I don't like worn rotors and they are not very expensive.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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