What exactly does the brake controller do?

aftermath wrote:
I also have a P2 and it has been great for me. The P2 is a proportional controller which means that it applies the brakes at varying rates. When you do a panic stop inertia throws you forward and the controller measures this and brakes accordingly. When traveling at 5 mph I doubt that you are dealing with much inertia. I don't have my directions in front of me but I seem to remember it saying something about driving at least 20mph on a level service to test the sensitivity and set the controller.

Here is another thing to look at. Do you use the Boost Settings? If you have the boost off, the controller will not impact you with full force stopping power until the inertial signal demands it. As you increase the boost, the amount of power sent to the brakes increases at the start.

I will increase the boost when coming down steep mountain passes. I want the brakes to be working now, rather than later when I might have to stand on them. In normal driving a lower boost setting or none at all might be better.