Originally Posted by Martin_D
You'd have to call Casey at AE Performance and ask him what they did for the race car. The brake boost assist system pulls vacuum when you exceed a certain level resulting in an inconsistent pedal. They were working on delete and do not know at this point if they finished with it.
At VIR it happened a lot, high speed 145+ ...
I just installed a brake duct system for front BBK's, it held up fine for the first track day. I will report back after this weekend and see if that helps.