I have a 1990 Mazda MX6 GT. The master brake cylinder went bad and i replaced it and made sure that I completely bled the new master cylinder. After installing it the pedal was soft but pumpt up so I bled the brakes. This also did not help so I replaced the front to rear proportioning valves. After rebleeding the brakes I still have a soft pedal. Sometimes it goes all the way to the floor and is completely random and unreliable. Thinking I must have gotten a bad master cylinder I replaced it two more times with the same results. In the past when calipers have gone bad they have always stuck with the brakes applied. Is it possible that I could have a bad caliper causing this problem? I think I have checked or replaced everything else. I also have not noticed a leak anywhere and the fluid level is constant.
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