When I've use my MityVac for bleeding brakes I always get bubbles. When you break open the bleeder valve and suck on it with a device it pulls bubbles from around the bleeder and not just fluid. Try having an assistant pump the brakes and drain the bleeder into a container the old fashion way and see if you still get bubbles.
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Andrew '04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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