The bubbles that will emerge from the master's reservoir will be tiny (back bleed)- You can bench bleed the master- but usually not needed as the system is very small in fluid volume.By filling the reservoir you've primed the system.Keep it full thru the process. The mighty vac just provides for you to be at the bleeder on the caliper instead of applying pedal pressure. Even when I use my vac I still have to get it finished with pedal pressure for a solid brake pedal.
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