Try this ...


Pull the plug on the main unit under the hood. It lives on teh passenger side near the firewall, and it has several brake lines going into it. The electrical conector has a safety catch on the side that resembles a t-handle. pull it, and the plug will back itself out of the socket. Push it back in a few times. IF there is a bit of a bad connection there, this might clear it up. Just work it back and forth a few times then make sure it's all the way in and leave it. Take a test drive...

It's that intermitent thing is why I thought I should post this. From a mechanic perspective, that is the FIRST thing I would check.