Anyone running Hydraboost?

I installed a hydraboost unit from an Astro van and it works great while driving down the street, but at slow speeds (in the driveway), the brakes lock up and throw you through the windshield. If anyone else is running hydraboost, what size bore is your master cylinder?

Haaa,Haaa, I just started a thread in the chassie section asking about Hydro boost.:yes::geek::thumbsup::rotfl:

I have a mustang one but haven't finish installing yet..
I know that camaros.net and the pro-touring.com boards alway talk about this stuff. Do a search on those boards and will be helpful..

Im putting an astro unit in my 80 malibu with ls1 f- body brakes front and rear. Im using a 1 1/8" mc, but I havent got to try it out yet. Can you post some pics of how you plumbed it?
http://i533.photobucket.com/albums/ee338/littlebaldguy/DSC00572.jpg
http://i533.photobucket.com/albums/ee338/littlebaldguy/DSC00561.jpg