The brake master cylinder is very likely not being allowed to achieve a full state of release, which seems to be a problem we are seeing more and more of lately with vacuum booster / aftermarket MC's (especially when spacer bullet / plug design MC's come into play).
Here are some links that will help get you squared away:
http://www.pro-touring.com/showthrea...Brake-Problems
https://lateral-g.net/forums/showthread.php4?t=17060
Do please remember to report back to let everybody know what you find, so that others can be prepared and learn from these scenarios in the future.
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
Just did this with PT.com
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