We recently stayed at a mountain top hotel where the rooms were located on some of the steepest inclines I have ever driven on (aside of an off road training program I went through with my Land Rover). Clearly steeper than I have experienced in San Fran or any other regular road. I was very pleased at how the E Parking Brake instantly held with no roll whether heading down or up the incline. I was also extremely impressed at how the HSA- Hill Start Assist system worked flawlessly. When I came to a complete stop and removed my foot from the brake while in gear, SilverFox held completely still until I gave it gas and then moved forward up the extreme hill. Kudos to the engineers!!!