Another problem you may have is that in the master cylinder the hole that allows fluid back into the res. may be too small.. The very first time we ran our dragster down the track the brakes would not release and were dragging... After the 1st full pass we made we could not push or move the car even with a golf cart... We released the line pressure with the bleeder screw and then in our pit spot figured out that the master cylinder was causing us some problems.. took it a part and drilled the hole out larger size and they have worked flawlessly ever since