Brake pedal goes to floor with engine running

Front are disc rear are drum. Bleeding technique is the good old 2 person pump them up, hold pedal, open bleeder, pedal goes to the floor, close bleeder, repeat the process. Starting farthest away from mc. I don't know how there could be air in the lines because I ran a quart of fluid out the rear and a quart out the front. I ordered a new mc this week. I will see if that solves it.