I tried a Mighty Vac. Then I threw it away. That six dollar job will work just fine. In fact. You don't even need that. Just run a tight fitting line from the bleeder screw to a jar half filled with brake fluid. Make sure the bottom of line is below the fluid level in the jar. Crack the screw open and slowly pump the brakes. It acts as an air lock so the air bubbles don't get sucked back in. Close the screw and move on to the next one.