Since it now actually goes, time for some brakes.
No fluid at all coming out of any of the lines...so pull the master cylinder apart. It had actually been resleeved, and once both the plungers were cleaned up, and a rebuild kit fitted, all good.

No not really, still no fluid. Do the same with the proportioning valve while your at it...still no joy.
Then check each flexible hose, bingo. Totally blocked/collapsed, to the point where you couldn't get a coat hanger wire though. Cleaned out for now, but will be replaced. A good tool was a $30 brake vacuum kit from ebay. Seriously usefull. Service the rear drums, and front calipers, good to go (or stop).

some replacement taillights, a bit or loom sorting and we have stoplights also.