I have a 91 560 SEL with 135,000 miles with a rear right wheel that sags ( the top of the wheels is directed in). The left rear wheel has no problems. I changed the accumlators 20,000 miles ago, the sub frame mount 500 miles ago. The hydermatic system seems to be in a working order. The car is in the correct hight, the shocks don't leak oil and the car stays leveled at all times. The top rubber between the springs and the frame looks good. the rubber between the shocks and the frame seem to be good too. All rubber bushing that is part of the suspension system in the rear looks good.

I took the car to a mercedes shop a while back and they told me that the pump and the level control value appears to be in working order. I can rise the car through adjustment in the back and the car will stay at the adjusted level. Actually the ride is better with the car rised higher than normal ( I thought of that as a solution but the car is too high for my liking.)

One thing that I noticed about the car is that the ride comfort is dependent on the mood of the car. At time the car rides great other times the rides is not good specially in city driving.

I searched through the posts at this web site but couldn't find a answer.


I just can't find the cause behind this problem. Any help will be greatly appreatiated

I would check the spring to ensure that it hasn't broken - it is the spring primarily that controls the height of the vehicle. I also have a similar ride problem with my SEL, sometimes it is beautiful and at other times it rides very hard. I am going to replace my accumulators and fully flush all the fluid, and then possibly look at replacing the shocks.

Matt.

I've also noticed my 73 450sl rides harder somethimes than others, but only slightly. I read something recently that suggested the ambient temperature has a signficant effect of cold tires; that is, if its cold out and the tires aren't warmed up, they would be much harder, and so I think the ride would be harder.