no brakes at all. pedal hit the floor. I don't see any fluid anywhere. master? on 1997 Chevrolet Venture

could it be the converter?

3 answers
It's not the convertor. Does the master cylinder have brake fluid in it? Sometimes a brake line fails and it sprays the fluid and doesn't show much of a wet area. If the fluid level is low, add some and have an assistant pump the pedal while you watch underneath. You'll probably find a leak. There is always a chance the master cylinder itself has failed, but they usually cause the pedal to drift down (fade) at stops before it just quits working.
insp all wheels for fluid leaks and master cyl. remove master cyl and ck the rear seal for fluid
Betting on the master cylinder has failed. Check to see if the rear seal is leaking.