I think there might be a nut with a setscrew in it that sets the brakes on Traxxas trucks. Dunno about the Revo but that's how it is on my Maxx. Just loosen the setscrew and tighten the little nut towards the brake lever and tighten the screw. Should work.
Wow, what a newbie question, huh?
Thanks for the responses... got it dialed in. That was a little too simple.. feeling a little embarrassed. But thanks again!