Hy 66dump, if you have bypassed the Hydrovac and have bled all the air out of the lines and cylinders and still only have half a pedal, then your brakes need adjustment. There is a special bleeding procedure for bleeding a system with a Hydrovac, you must bleed the two Hydrovac bleed screws before moving on to the wheel cylinders. As others have mentioned there can be problems with the flexible lines collapsing from the inside. There is a simple test to check that the Hydrovac is functioning (when it is connected to your system), with the engine off pump the brake pedal a few times, now press down on the brake pedal and start the engine, if the Hydrovac is functioning the brake pedal should move closer to the floor under your foot pressure, hope that helps.
