Very necessary to bench bleed master cylinder, I found rubber vacum line that fits the brake line outlets so tight that I can screw them in and put all three lines in resivor at once makes bench bleeding a snap. You have to bleed all four wheels
I start at right rear, then left rear ,right front left front. Also if you have the double chamber resivor make sure that the front chamber fills. I use a mighty vac to bleed the calipers so can do the job by myself very quickly.........

William Rogers.......