Would you believe it.... I Finally find a Couple of Posts Discussing a Cutter Break.
http://www.azrockcrawler.com/_images/projecthr4/projecthr422/projecthr422.html
Project number 4 was to install a cutting break lever. Up until now I had used a pair of line locks to act as cutting brakes but it's just not as smooth or as easy to actuate the brakes as a dedicated lever. I picked up the cutting brake from Polyperformance, it's made by CNC and is 2 in, 2 out. Having no hard lines in my system made hooking the new cutting brake into the system a breeze. I just ordered the needed fittings along with an extra pair of SS braided brake lines from Speedway Motors and then rerouted the existing lines.
and
http://www.thesamba.com/vw/forum/viewtopic.php?p=2530055
Take the single line that goes to the back of the car and shorten it to go straight into the center port of the cutting brake system. Then out of each side goes a separate line back to each wheel. Essentially you are taking out the factory "T" and putting the cutting brakes in its place (And relocating obviously)
Once installed bleed brakes as you normally would (Do not pull the handles on the cutting brakes). That should about do it.
HINT: When mounting your cutting brakes keep them as low as possible (They are easier to bleed). I've seen guys mount them above the shifter on a center type of console (rail) for easier access. Impossible to bleed.
The brakes for the back wheels will over ride your hand brake. It is all the same line. If you are grabbing a hand full of brake on one side and stomp on the foot brake your hand will get thrown forward. Your foot brakes always over rides the hand brakes.
And yes you can gas while holding a brake It will put you side ways or help you take a corner. With disk brakes you can actually steer the car down the road with out the steering wheel. Not at all recommended but this gives you an idea how effective they are.
Edit: Added crude drawing.
The green is stock car. Red is what you will need to do.