I have a 90 grand prix ste with the turbo 3.1L. I just got the car and I'm slowly working out all the problems with it, and the biggest one is the brakes. I took it into Les Schwab today an they told me that it has a hydroboost system, and that they can't fix it or even get parts for it. I'm trying to figure out if it will be easier and cheap to fix it, or if I should get rid of all the abs stuff and convert it over to a vacuum boost system. Any help would be greatly appreciated. This car would make such a great sleeper, but I don't want to put a lot of money into it.