Brake Lines Blown While Towing with Toyota Tundra!!!!

It makes no sense that you lost all braking capability. :h

As pointed out above, all brake systems that have been made since around the 70's have a split system. How modern brakes work.

Duel reservoir in the master cylinder, duel or shuttle piston, duel lines front and rear. Everything is redundant. It's built that way just for the reason you encountered.

You should have had some brakes, either complete front or complete rear.