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Originally Posted by nholmes
The only issue I've ever experienced with a vacuum method is that it would often draw air in past the threads on the bleeder, which gave a false positive of there being air in the system.
I let a friend "try it" on my car to show me how much less work it was than my Motive system and he never stopped. I eventually had to intervene and show him that if we switch to using the Motive, the bubbles would stop. Sure enough, suddenly there was no longer air in my brake system.
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True. You will see air bubbles when using a vacuum bleeder. It's what happens when fluid flows out of a small orifice into a larger diameter tube.
The bubbles will be consistent. You're looking for bigger air bubbles or disruption in the flow near the bleeder fitting which would be air leaving the brake system.