Been there.
This actually works, at least on any car I have tried it on. Not by the book, but hey, in a pinch... Each time you let go of the pedal, some fluid/air goes back in, but not as much as came out on the previous stroke.

Just takes more strokes to get it done.

Best if you can use your hands to push pedal, or otherwise contort yourself in such a way that you can see when the air bubbles stop coming out upon depression. Also helps to crack the valve open as slightly as possible, so somewhat less comes back when pedal is released. (Crude check valve!)

Not absolutely sure this would reliably get all the air after 'upstream' work, like an MC replace, but works fine for 'wheel-side' components.

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1986 300E 5-Speed 240k mi.