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be careful of using these mechanical vacuume pumps. I used one (mightvac) to bleed my clutch resivoir. after I was done I had NO pressure. It turns out that the seals associated with the clutch and brake master cylinder can't handle the vaccuum. I had to rebuild my master cylinder. Not hard, but did cost me a weeks riding and 40$ in parts.

My advice is don't pull a lot of vaccuum. Suck the old fluid out of the master cylinder FIRST w/ the vaccuum pour in the new fluid and draw it through slowly.
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