It was the master cylinder. I replaced it and the lock up problem is solved. I now have the red brake light in the instrument cluster illuminated. Apparently there are 3 things that can cause this.
Parking brake switch .... didn't mess with it
Low Fluid warning switch
Brake pressure switch
A little more diagnosis is necessary.
I found this post which was helpful
https://www.corvetteforum.com/forums...-light-c4.html