My brake booster is not new, but if im not mistaken shouldnt I bleed the brakes with the engine off? In which case the power boost would have no affect on its performance, in other words if my car stalls the brakes would still work, just harder right? So I dont start the car before bleeding my brakes do I? One more question also, that combination valve what exactly do I press, mine had a rubber cap on it, is that round what looks like brass piece that sticks out of the end supposed to go into the valve body, or is it just that little pin in the center of that round brass piece that gets pressed in. Im making progress with this I think, you should see my garage floor, looks like a lake of brake fluid, I havent got it on my paint yet though. I bench bled my master cylinder by the letter of the instructions, gonna try again tomorrow, but if you can, please get back to me about that combination valve and what exactly gets pressed in to bleed. Thanks alot for any and all help already.