As I was driving to lunch today. I went to stop at a light, and the pedal started normal and then got really hard. The pedal needs to be pressed extremely hard to get the truck to stop. I changed out my rotors about a month ago, but have not had problems until today. Could it need to be bleed? It's almost like the booster went out or ...?

I am still at work and I don't think I want to drive it the 30 miles home on the highway.

Any help would be much appreciated!

1994 X-Cab V6 Auto 4X4 (3VZ-E/A340H)