I am a novice at these things, but my truck has a single hydrovac. I redid the brakes, my pedal feels kind of soft. I usually pump it once or twice, mine seems to work quite well. Their the best brakes I have ever had on an antique. When I have really had to stop, it has stopped short every time. The system has impressed me.
I am not sure, but it sounds like yours is working. I would try driving it around abit, just be careful, pick you road careful and you well find out quick how their doing, maybe get a lot of confidence in them, good luck. I am learning so I will be watching the replies as to what others say, Tom.