I use this system also. Works better if you just crack the bleeder. If you open it to far the system wants to suck fluid from the jar instead of the master reserve. Another tip is to put a curve in the hose so that the top of the curve is above the wheel cylinder and then down into a jar. This will let the bubbles "float" up the hose and away from the wheel cylinder as you pump. Bought one of those suction bleeders and went back to this system.