Well... you do all this bench bleed and then put the MC on the car with fluid and pull the plastic plugs out and let brake fluid pour everywhere while you put the hard lines on. At least this is what the directions always said. I’ve just never ever had to bench bleed a master. I’ve done pressure bleeds with a helper, mighty vac, crack bleeders and let gravity work... maybe I’ve just been that lucky but I’ve just never done it.
