Yah, they are wicked hard to bleed, by design.
You can reverse bleed them, with either a pressure or vaccumn setup.
In the field, I found that you can get the pedal to pump up, by quickly pumping the pedal (~1/4 of the full stroke). Once the pedal comes up, you can bleed 1 stroke, then you have to pump them up again.
Hope this helps...
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