Hydratech Braking Systems has a HIGHLY EXPERIENCED circle track veteran, Jim Petty, that can directly work with you over the phone to nail down where your issues may be:
http://www.hydratechbraking.com/contact.html
5 minutes with Jim can truly get you directly on the right path, so don't hesitate to call him and discuss your installation. He will clearly identify your issue by concisely interviewing / analyzing your specific build details, and then get you headed on a clear path to success.
Until you get Jim on the horn, read this article to get some further diagnostic tech "uploaded" into your mind:
http://hydratechbraking.com/braketech1.html
Summary? Call Jim - he is REALLY GOOD at what he does
