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Old 02-02-2010, 09:12 PM   #2
Track rat
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Join Date: Nov 2006
Location: Cucamonga CA
Posts: 3,687
The most common cause for vibration at speed is tire balance. Sometimes a wheel just throws a weight. Have your front tires rechecked. If it only happens under braking it could be dirt in the pads or warped/cheapie rotors. If steering bushings are worn out you should feel a little play and imprecision in the steering at all times.
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor
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