Brett13 what is there on your '07 that tells the computer that the rear end is loaded and sagging?
Must be some kind of sensor that measures load weight or sag. If it is mechanical it could be adjusted to still show load?
Patrick,
That is a good question. I looked and didn't see anything. Also asked the question on tundrasolutions.com, no one knew of a mechanical mechanism either. I think it must be sensor related, but honestly I don't know how its done. The truck brakes extremely well when loaded- even with the airbags holding up the load. There is a tow/haul switch on the dash which increases engine braking and uses higher rpm. Perhaps the T/H switch adjusts the brake power as well? I do know that this truck is FULL of electronic traction nannies. Hit a slick spot and you think the truck needs to be rebooted, CTRL-ALT-DLT style, but it is actually just doing its job- and it does it well. So, to answer, I'm not 100% sure how it does it, but I haven't found a mechanical device that does it either. And Toyota calls it an "electronic brake controller" with "brake assist"- whatever that means. I'll ask my dealer next time I'm in.