The brake hold button, when engaged holds the brakes when you come to a complete stop, so that you can effectively take your foot off the brake pedal, the car will stay stopped until you hit the gas again, it then disengages the brakes. You turn the feature off by pressing the button on or off. What you might have experienced with the incline, is the hill start assist... this feature keeps the car from rolling backwards when you lift off the brake until you get on the gas to make the car roll forward. Two separate features. Not sure if the hill start assist has a disengage...