Classic bad master cylinder. It's no longer sealing to the bore internally and won't hold pressure, it may or may not be leaking. If it is leaking the fluid can be accumulating inside the power brake booster which will eventually make the booster fail. Get a replacement master cylinder, bench bleed it, and mop out as much fluid as you can from inside the booster.

I'm also in Lutz so if you want to get together and gawk at it shoot me a private message and let me know.