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It's vacuum, it attaches to the other end on the bleeder. I leave the cap off the master, check the bleeder to make sure it's not too tight, attach the vacuum hose to the bleeder (w/ adapter), pump the vacuum up and slowly open the bleeder. I get air, then fluid & air and finally just fluid. Tighten the bleeder before removing the hose. Check the fluid level in the master cyclinder then go to the next wheel.
I usually don't have to do anything to the pedal while I do this. Put it sounds like this particular system may be tricky. You might have someone at the pedal while you do the vacuum bleed. Maybe try light pressure and release or "Slowly" pumping, but not too much pressure on the pedal.
I always bleed each wheel the old fashion way, usually right after I vac. bleed each.
You asked about bench bleeding the master cyclinder on the car. What I done before is have someone pump and hold pressure on the pedal, then loosen the brake line at the master cyclinder, repeat till you have good fluid flow. But remember, brake fluid removes most paints. Maybe have a shop rag or something over your hand & wrench as you try this.
Don
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