On my 2008 w211, whenever I start on steep hills (~40 deg) sometimes the car slightly jerks backwards, as if a new driver is trying to do a hill start on a manual, although it's a very short distance. I figured it's normal, and just got used to it, later I found out some w211s should have hill assist, which is a separate thing from the HOLD function, some places state that all facelift cars have them and that my brakes/parking brake are the culprit, though that was a single posting and I couldn't find any definitive answer. My transmission is a 722.9, and the car is a classic trim level if that even matters. Thanks.