Today I had to slam the brakes down to avoid hitting some one who did the same infront. I was scared because the pedal froze. I stopped the car to check this, and realised that if i push the pedal really fast, its very stiff, and gradually moves down, you can hear the pump coming on.
Is this the fluid? the booster, anyone with any ideas?
Is the booster on this car, the ballast looking thing on the opposite side of the master cylinder?
It sounds like something vacuum related to me. Start the engine for a few seconds, then have someone else turn it off while you listen for leaks around the booster. Yes it's that ballast looking thing attached to the master cylender, or rather, the master cylender is attached to it.
I had someone come in a couple days ago that had the same symptoms you're describing. It turned out to be a hairline crack in the check valve that was leaking. The check valve is that plastic fitting that the big vacuum hose connects into on the booster. It's basically a one way valve that should only let air out, and not let air in. The hairline crack was letting air in and depleating the vacuum supply.
I'm not saying that your check valve is bad though, because I can't see it. I'm just saying that you should check for small vacuum leaks and such around the brake booster.
Are there any more symptoms? Say for instance, High idle? or sporadic idle speed? or codes?