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LukeG
My bad wording. Just standing normally on its 2 wheels, probably resting against a wall or something to keep it steady for a while. Some people hang their bikes vertically by one wheel, and if you pulled the brakes when it’s hanging like that you might get some air issues.
You want the lever to be the highest point in the system, so any air bubbles can make their way up to the lever. If you had your bike hanging by the front wheel, the calliper would probably be higher than the lever, which would throw off the test I described.