Ok..... i've done the homework, read the manual about 3 times.....the manual tells us how to "activate" and "deactivate" grade braking by using the "tow haul" button. I understand all of that.....AND, I do understand what "grade braking" means as I have used that concept on previous vehicles for many years.... manually downshifting to a lower gear to help lower the speed of the vehicle as you descend a grade. All that being said..... i don't seem to understand WHEN the Escalade does this automatically , OR how you know that it is actually doing something ..... have coasted down some pretty good hills and noticed nothing different......any clues on this???? The manual does not say under what conditions the system activates or anything like that....just tells you how to "turn if off" if you don't want it. Thanks!