.
Here's the info I found so far...
----------
"Roadmaster Inc makes a mounting bracket and wiring kit #751426. The kit is made for making an Uplander towable behind a motorhome, but should be ok to wire into a brake controller. The reason this switch is needed is because the factory switch on the brake pedal isn't an On/Off switch. It's a variable resistance switch going to the BCM (Body Control Module). The BCM outputs to the rear brake light through a white wire on connector 2 pin 30. The problem with this wire is that when no brake is applied there is still 2 volts present. I hope this helps."
Source:
http://wiki.answers.com/Q/How_do_you..._2006_uplander
Also see:
http://roadmasterinc.com/products/br...ht_switch.html
Road Master Inc -> how to install OFF/ON switch on vehicle's brake pedal.
http://www.roadmasterinc.com/pdf/751426.pdf
Note: 12Volt 12 guage wire goes from Battery "+" post to 10A inline fuse, to 751426 (foot brake peddle switch), to newly installed Brake Controller's Red wire. When the van's brake peddle is pressed, the "extra" brake pedal off/on switch is "closed", and the Brake Controller unit is then 12V powered. Take foot off brake pedal, brake pedal switch "opens", and no more 12V power to Brake Controller. And, one doesn't need to TAP into the vehicle's factory 12V wiring (and its factory brake switch - that feeds into vehicle's BCM unit).
--------------
For simular "OFF/ON switch installed on brake pedal" on a different vehicle, surf step 17+ within:
http://www.bmwmotorsports.org/pdf/BM...er%20Brake.pdf
-------------
Also see Universal Brake Pedal switch:
http://www.cartpartsplus.com/brake-s...997f5b0b217b26
-------------
If wondering.... If my new '09 Montana EWB has a factory "variable resistance " brake pedel switch as well, I'm going to order/install Road Master Brake Switch (re: mounting bracket and wiring kit #751426) for my future Brake Controller as well.
.