I always bleed the brakes on these cars with the engine running as I've had problems with no fluid getting through which I blamed (rightly or wrongly) on the stupid pump/bomb based servo system, its always worked for me when I have it running, without it running I find it extremely difficult to get fluid through the system, have you tried to undo the union at the compensator valve to see if fluid is there ?
However are you saying the ABS unit is not allowing fluid through as I've never come across that before, could it be a stuck valve in the ABS unit ?
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