My brakes feel almost completely useless. The pedal has absolutely no resistance until it is almost bottomed out. Then, it gets insanely stiff, but the brakes don't grab well at all. The car has later fox brakes, and an '85 town car master cylinder, as well as a fresh proportioning valve. Everything is new. I believe that the issue is the town car master cylinder. Is that in fact the case? Or is there some sort of adjustment that I need to do? The brakes are fine for normal around town driving, but if I needed to stop suddenly, I would most certainly run into whatever shoots out in front of me. I also wouldn't trust them over 50 miles per hour period.