karllap

Hi,
I have some knocking noises coming from my suspension but don't know which bush is which when it comes to ordering and replacing. Does anyone have any pics / diagrams of which component is which for both the front and the back and how to's would be really handy if any one has any.
I appreciate that it may not be the bushes and possibly a shock or spring but thought the bushes would be the easiest place to start

Its a 2008 W209 CLK 320 diesel

Thanks

Anker

A good test to perform is to determine whether the rattle occurs under acceleration or braking over a bump or hole. If it disappears under those conditions its a trailing arm that's bad, otherwise its one of the other bushings. What this test determines is whether its longitudinal or vertical movement that causes the noise.

karllap

Thanks for the reply, it happens going over bumps, I haven;t noticed hearing anything at all during acceleration or breaking. So what does that mean?

Anker

Trailing arms. They are relatively inexpensive and easy to replace.

Anker

Just making sure you understood me correctly. What I meant is that if you don't hear the rattle going over bumps while at the same time accelerating or braking, then its the trailing arms.

karllap

Sorry, I'm lost.
I don't hear any knocking accelerating or braking but do hear the knocking when going over bumps or mainly over uneven ground

Rudeney

I assume this is the front suspension? If so, there are two common sources of noise. One is the anti-sway bar bushing and the other is the busing on the torque strut, a.k.a. upper control arm. It can be difficult to determine which it is unless you can duplicate the noise on a lift and isolate which part causes it with a mechanic's stethoscope.

karllap

Thanks for the replies everyone.
Just wondering if anyone has any diagrams or pictures and possibly even part numbers which will show me which bush is which and will also help me find some guides?

It is mainly the front but would also like some information for the back if possible please

Rudeney

These parts diagrams show the two front control arms:

http://benzbits.com/w203/FrontSteeri...rtsDiagram.pdf
http://benzbits.com/w203/FrontSteeri...ePartsList.pdf

Here's the rear:

http://benzbits.com/w203/RearSuspensionDiagram.pdf
http://benzbits.com/w203/RearSuspensionPartsList.pdf

For the anti-sway bar bushings, I need your VIN to lookup the proper parts.