MY 2002 S430 SOUNDS LIKE A 64 IMPALA WITH HYDRAULICS. AT FIRST THERE WAS A SLIGHT KNOOCKING NOISE ON THE RIGHT FRONT PASSENGER SIDE SOUNDS LIKE SOMETHING WOBBLING OVER EVERY LITTLE BUMP. NOW WHEN I TURN OFF THE CAR THERE IS THIS LOUD RUSH OF AIR ,,LIKE LETTING THE AIR OUT OF A TIRE I DON'T NOTICE THE CAR GETTING LOWER OR DROPPING THE HEIGHT BUT DOES ANYONE HAVE ANY IDEAS ON WHAT IS GOING ON ?? HELP

 

sounds like ur struts are bad. i suggest taking it to a dealer for the exact cause

 

The knocking noise I would say from lower control arm or ball joint common problem. About the air noise can you tell where the noise coming from and for how long ?

 

The knocking noise I would say from lower control arm or ball joint common problem. About the air noise can you tell where the noise coming from and for how long ?

 

The most common problem of the shock is a leak at the top. open the hood and check for a hairline crack on top of the strut. If your strut is in good shape then get the repair kit for 65 dollars. THe labor on the kit is 5 hours though.

 

Had the same problem...the shock is shot...I heard my noise everytime I was at low speeds and would hit any bump or pull out of a parking lot and the road was a different height..the air noise is probably that the shock absorber diaphragm has seperated...both the noise and the air noise should be fine one you buy a new shock absorber...Mercedes wants $1070 but I got my from a ebay store for $635 shipped...simple to install..need help PM me

 

when removing the lower two 5mm hex screws on the lower part of the shock, hammer the 5mm bit in a couple of times. That screw is threadlocked in place and due to it's small size, it strips out and you will not be able to remove it then.

 

thanks manyou wer right on the money it was a bad controlarm , roll on bro!!