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Nice info. So we are saying about 1.5-2 liters for a brake job it sounds like.
Professional vacuum bleed will use about .9 liter, or two bottles. Buy 3 bottles, ie - 1.5 liters, if you are doing it yourself for the first time so you stay on the safe side, and do not run out due to unforeseen causes, like spills and pumping additional clean fluid.