Breaks system and break flushing

Hello,

As I was working on the break system, it looked to me as if the system
was "open" ie, if you do not press on a pedal, air bubbles up to the
break fluid reservoir, and if you have the bleed nipple open, break
fluid will drain from there.

So, my question is: is it acceptable (especially when alone) to "bleed"
the system just by opening the bleed nipple and waiting a little bit?

Cyrille

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