I was bleeding some brakes today using a my-ti-vac. When I cracked the bleeder screws and tried to pull a vacuum, the needle moved then just fell off to 0. If I closed the screws, it would pull vacuum just fine so I think it was leaking at the threads. I cracked open the screws and pumped the master till I saw fluid coming out the tubing into the canister,and then tried to pull a vacuum,but never got pure fluid.It was like leaking at the threads. I'm going to go back and re-bleed with someone to help,but wondered if anyone had a fix for the vacuum way?