Works ok my old lady is in a carpeted garage (shut up) and the wedges are digging in - I've also tried the rear wheels on level concrete and they hold up too. Now that it's out, rolled on some cardboard to insulate the tires from the cold (shut up) they seem to be holding up too, I can't push the Neckarsulm tower forward or backwards even though the parking brake isn't on and in Neutral position is until spring. Decent pads. They are what they are.