Down shifting the transmission for braking assist

On descents I always downshift to maintain speed rather than ride the brakes. If I have my cruise control on the Benz will often do it for me. Around town or low speeds (if towing) I may just shift manually through the box to keep it in a lower gear so I have boost and braking. The tip shifter makes this quite convenient. I even shift up nudging the shifter with my knee sometimes.