I have done those tests, not necessarily exactly in that order, and the brakes pass. I have downloaded that manual now, so I can do it in order, and exactly.

I did not disconnect the booster vacuum line, I will try that tomorrow if I have time to work on the car again. However, if the booster check valve leaks, it usually means you get intermittent power assist or none at all, because the brake booster will not hold vacuum. I clearly get power assist when the engine is running, the difference is easy to tell.

With the engine running, driving or full stop at idle, the pedal will gradually sink to the floor unless I give it 2-3 quick pumps first. Since there is no loss of fluid, I would have said that means fluid is leaking past the seals inside the MC. The pedal sinks gradually with an even pressure. Does not feel like air in the lines.

I will see if I can get the banjo bolts off, too. Thanks again for the tips.