I imagine after you look at the front cylinder you will find some peace. Be sure that you are doing the bleeding in the proper order. Essentially you start the furthest away fromt he master cylinder and work your way closer.
It will probably be left rear, then front left, rear right then front right.
I had to put a huge amount through my truck and finally got that one bubble to finally pop out.
The vac has been bypassed? Carefull under load, you may not have the brake power you need.
