IBNZ Monkey,
I have used that brake on a number of karts, and I honestly hate it. It is cheap, and I have not found another good low cost solution, but once you play with it, you will understand why.
First problem, is that the spring return is now worth anything. Plan to build a spring return into your design. Next, there is no design based mounting location. Using the bolts (from the back) is the only real way, and that is a pain for my designs.
I am importing some brake calipers that I think are superior to the other machanical solutions out there. They kind of remind me a larger bicycle caliper.
Russ Barrow
Russell ATV