Brake pedal stops normally then slowly fades to floor. Master cylinder? Booster?

[steved0x]

I had that issue after I installed stainless brake lines, turns out I had a small leak in one of my back brake lines where it connected to the hard lines. I didn't discover it until the brake fluid low light came on, right as I was about to start my autocross runs at Daytona. That was just me, when I was searching the "brake pedal lowering" issue I seemed like I saw a lot of Cayman folks had it, but I stopped searching once I resolved my particular issue.

Steve

[Rotmilky]

Hmm, I would think that a brake fluid leak would allow some air to get in the line. If air was in the line, the brakes would feel squishy. I guess you had a leak where fluid would leak out but air wouldn't leak back in? Did you happen to notice brake fluid leaking out of the fitting?