Jay,

Gravity will most certainly take the bubbles with it.

I have a pressure bleeder, and ever since the auto mfg's started using
proprtionng valves it will not function properly.

It will kick the valve to the opposite end of the car, and the valve has
to be constantly re-set.

Gravity bleeding works just fine.
If you want one of those, vacuum pumps, be my guest, but all I'm saying
is that they are not necessary.

Later,

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Terry
74 Campmobile (Clementine)
85 GL
86 BMW 325 ES