lol. "i ate **** on my bike and now i want to run less brakes"

like highonpez said, you would have to rebuilt the rear brake with the bolt from the front brake, provided your brakes are even old/cheap enough to do that. a picture of your brakes would help.

p.s. if you haven't ever rebuilt a brake before, it's not super hard, but it's not easy enough to explain via the internet.