Iv been looking at a 2004 S55 recently that i want to buy and one of the first things i asked the chap over the phone was about the suspension. Glad to hear he was a Merc enthusiast and knew what he was actually driving as opposed to someone who just jumps in to get from A to B. Anyways, he knew about the whole suspension issues with these cars and he told me that about 3 years ago the ABC pump did indeed fail on the car and was replaced with an "updated" pump. I didnt know there was such a pump. So how true is it? Did Mercedes make some revisions to these pumps to make them better? Thanks.