i2oadi2unnei2

Whoa, you're the first I know says 20-25 MPH. 10-15 is what I generally hear/see from other folks. The lock-up test on gravel is mentioned often just so that you/one don't lock it up late, but as you said, each to their own discretion to use when testing/tuning their TBC settings. And, when you're traveling on dirt and gravel road, one should be going slower than paved roads so if you ever have to this that TBC, that TT hopefully don't fishtail! Just a friendly reminder to all, SPEED is always a factor so try to stick to posted speed limit. It's not how fast you get there, its the adventure

BlackBoost

20-25 MPH is right in the manual for doing this test, and I think if you're going to slow, it won't apply enough braking because it takes your speed into account to calculate how hard to brake. I agree that speed is a big factor. The truck also doesn't apply the trailer brakes like the truck brakes, it's delayed in applying and will gradually go up to the max brake force if you're just slowing down. Slamming the brake fast though will indeed make the TBC to go max force right away and this is when you might have a lockup.

Like I said, I can only see anyone having to do this if an animal jumps in front of your truck, but you shouldn't be going that fast on a gravel road anyways. Regular braking to come to a stop or to slow down for a curve in the road will only partially apply the brakes. Keep the trailer status screen on and you'll see how it works differently than what you're doing with the brake pedal. You can keep a constant pressure on the brake and the trailer brakes will change depending on your speed. When coming to a stop, the brake force climbs right before you stop and then drops down again. Seems like a very complicated program that takes brake pressure, speed and deceleration into account.