I removed the plastic fluid reservoir and the two robber grommets underneath, cleaned it all out as best possible. Still no obvious pressure or suction on either piston entry, and the plungers are still bottoming out. I cannot tell if the pistons are moving or stuck.
I then removed the brake light switch from the side of the master cylinder; activated the brake pedal and some fluid came out. Holding a finger over that hole and pumping the pedal, I can feel pressure at that location. I have a picture/drawing of a similar master cylinder, but with no breakdown of internal parts.
I'm going to the nearest city and look at a pressure/vacuum bleeding tool, and if it appears it might work on this system I'll buy it.
Running out of ideas and options.
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