I've left tape over the vent hole for 2-3 WEEKS while doing a large-brake conversion on the front of mine, and for 2-3 days while changing out a failed/leaking dual-diagonal circuit junction. If air can't get in the top, fluid can't get out the bottom. Much easier and more elegant than the "stick" - which also works. Just fill reservoir all the way to the top. And, of course, check to be sure it's doing it's job. I usually wipe the top of the cap off with alcohol or brake cleaner to be sure the tape stays stuck.
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