Threads dont seal. So i put a nut on bleeder. Then an o-ring. Snug it up and bleed brake. Then remove nut and o-ring and one final bleed. i have little faith in vacuum bleeding.
Pressure bleeding or gravity bleeding are my preferred methods.
UAR.....the more I get into this the more confusing it becomes for me......I am a B grade shade tree mechanic. Old school mechanics down the road from me prefer your method.
