They do work well and also like the 1 man brake bleeder fittings . I just slip a vac hose over bleeder farthest from master cyl. and let it gravity bleed with great luck. Make sure not to run resivour dry or you have to start from scratch.
Make your own system for bleeding brakes, it is VERY simple. Attach about 3 feet of rubber vac hose to brake bleeding fitting. Attach or run the other end of hose through a hole poked in a Qt. jar lid and hang in jar about one inch off or up from bottom. Poke a second hole in lid for pressure/air relief in jar. Now fill jar above he hose run from fitting or about 3 inches in the jar. Open fitting and allow gravity to fill hose or until air bubbles stop. Now you can pump the pedal slowly !! Down pushes fluid out of system into jar and allowing peddle to slowly raise will suck fluid not air back into system Slowly repeat until all air is out of system. Use hemostats or locking clamp plier to plug hose at jar top so filling hose each time wont take long.