ib516 wrote:
I'd be surprised if the service brakes are activated without the pedal being pressed. Yes, I know radar (adaptive) cruise control systems do that and so can those pre-collision things, but that's different than a computer dragging the brakes down a grade. How do they know when to "let off" so they don't overheat? Temp sensors in the brakes now? I can't see that being the case.
I think the exhaust brake slowing the truck activates the brakes lights as they are programmed to do.
I am 100% certain that my Ford operates the truck brakes, trailer brakes, brake lights, exhaust brake and transmission shifting automatically when the auto exhaust brake is selected. It works extremely well.