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I've used the MityVac for self bleeding the brakes. If you don't have an air tight seal around the bleeder screw you will suck air in fooling you into believing you are getting air out of the brake system. Make sure your hose is air tight.
I have too, and some thread sealant on the bleed valve screw will help with the air incursion, but, it's not really a big deal as it does an excellent job, air bubbles and all.
Thanks for the replies guys. Picked up the Mytivac kit yesterday from O'Riley's. Found after the fact I paid some bit more that I would have from Amazoone but I was there and no shipping.
Mike