To adjust mine, ( in the rear line), I went to a open parking lot and did a bunch of 30 mph stops. Start with it wide open, mine would lock the rear wheels pretty easy. I kept closing the valve with each hard stop till the tires just slightly skidded but not leaving black marks. I figured 30 mph was a good test speed, I have also tried it at 50 mph and it still stopped straight with no problems or skidding with a heavy quick brake application.
I think its a good idea for everyone to do a couple of quick stops, you need to know what the truck is going to do in case you really need to panic stop. In my case, its going to go where I point it, and not come around on me with tires smoking!
Joe
