[deuce_roadster]

I think you have a bleeding issue. Put some speed bleaders in the front and put tubes down into a can on each front wheel and crack them open so fluid can come through. Now bleed the back brakes as normal. Because the fronts are closer to the MC, once they have pressure no more or very little fluid will go toward the back. Or you could put speed bleeders on all 4 corners but the key is you have to have the fronts letting fluid out until you get the rears done. I have seen this before.