Hey Boneca, When did you last swap brake lines? They could be getting old and flexing more, or the center rubber lines above your rear differential could be leaking slightly...those drip onto the diff and you wouldn’t see a puddle. It could still be your master brake cylinder diaphragm as you described, but if you haven’t replaced your brake lines I would do that first for preventative maintenance and then bleed the lines with power bleeder and scan tool to activate abs. If that doesn’t work then go after the master cylinder.
UUC and I believe turner and ECS make exact fit lines. The center pair above the diff is a pain...I still haven’t figured out a way to swap those without dropping the exhaust and differential.
Last note: check the vacuum lines for the brake booster? You said the brakes feel soft...is the pedal hard though?
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