I bought my 86 Mustang five years ago, and have had to replace the master cylinder four times. It's showing the same symptoms again. I've flushed the system, used new master cylinders, rebuilt cylinders and even a nos Ford cylinder. Each one lasts a year or less. Even had one fail completely without warning leaving me with no brakes at all, which I didn't think could happen on a dual circuit system. Has anyone else experienced this or have a possible solution?
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