I just bought the car after it sat for 8 years. Just replaced the master cylinder and most of the rear brake lines. It has a decent cam that is only producing 12" of vacuum. So I went ahead and put a can on it. No real noticable difference. I hooked my Mityvac to it where the hose attaches and it won't pull any vacuum at all. I'm guessing it's toast. What do you guys think?