That's pretty scary- glad you're okay.
Did you peek underneath to see if you lost a brake line or something up front? I suppose you'd see more fluid if so, but maybe it would only come out while activating the system. If the inside of any of your tires are covered in fluid, then you certainly lost a brake line.
Reminds me of the time in my old 70 280SE when, after kicking it down a gear to pass, the throttle linkage got stuck fully open. That was an exciting few minutes worth of driving... But losing all brakes is certainly scarier. Good luck-