Originally Posted by jopizz
My first thought is that you are low on fluid. If that is ok then check to make sure you have vacuum to the modulator.
Thanks John. The fluid is exactly right, clean and healthy looking, with no smells.
Where is the vacuum connection and the modulator? You might be onto something because I heard a hissing noise, like a noisy vent from low down on the passenger side just before the failure....sounded like it was on the other side of the firewall near the front footwell.