[lbperry]

You can reduce the brake pedal travel, and increase your mechanical advantage, by moving the point where the pushrod attaches to the brake arm up (closer to the brake arm pivot point).
Depending on your brake pedal/pushrod mechanism, that may not be possible on all systems. And you have to make sure the pushrod moves linearly into the MC, and, above all, doesn't go over center so the pedal won't return.
I was having problems with my FFR braking system and had to redo it like this to get it to the point I could lock up the brakes.