The problem as I see it with pulling a vacuum right on the bleeder is air bypassing that can occur through the open bleeder threads.
The most effective way is to bleed across the entire brake system i.e. Master cylinder reservoir to caliper. I have on of the Motive Power bleeders, they are not very expensive and make brake and clutch bleeding a simple one man task with no fear of bleeding dry the master cylinder reservoir.
Julian
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