I was on a 45 degree hill. I lstopped and let off the gas to see what would happen. It rolled back a foot and engaged the brakes for 1 second for three times then stalled the engine and I rolled down the hill with no power. Its only useful for stopping your engine from dying when you let off the brake for a split second... it does NOT hold you still if you are on a VERY steep incline. You will move a good foot or so between pulses.