Had this issue after caliper rebuild.
Performed bleeding, fluid seemed ok but on a test drive brake pedal seemed softer. No sinking with engine off, but sinked to the floor in like 30 seconds with engine on without very much force on the pedal.
Repeating the bleeding procedure solved it, fluid went out without air for first couple of pumps, but then pushed out some bubbles. After that everything went back to normal. Pedal will still sink to the end but extremely slowly (will take minutes) and with a lot of force on the pedal, but as far as I know it does that in most cars.
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