Replacing thrust (aka lateral) arms only - Mercedes-Benz Forum
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#1 (permalink) Old 10-31-2011, 02:23 PM
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Replacing thrust (aka lateral) arms only

I've been gradually replacing suspension components. It would have been nice to do everything at once, but while striving to only replace what's worn, EVERYTHING seems worn!!

Anyway, I've done ball joints, control arm bushings, end links, struts and still have a slight creaking noise when occassionally stopping. I inclined to think it's the lateral arms which has been confirmed by the dealer.

Two questions: How is this DIY if it's the only thing I'm replacing?

While I'm inclined to keep using OEM for all my parts, I noticed that AutohauzAZ has Febi (which I believe is Boge) for a decent price. Any thoughts on using them over the OEM?
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#2 (permalink) Old 11-01-2011, 05:05 AM
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dmarti02, you can repalce these arms fairly quickly and easily without disassembly of any other of the front suspension. You will need an alignment done after the swap, and personally I only used MB OEM parts when I rebuilt my front end, but I also get wholesale pricing from my dealer so the cost difference between aftermarket and OE was minimal.

You can order OE parts at wholesale pricing from MB of Ft Lauterdale here: http://www.trademotion.com/partlocat...&siteid=214089
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#3 (permalink) Old 11-01-2011, 09:24 AM
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Thanks for the link. parts.com is even cheaper for OEM MB by like $15 each on that thrust arm. Autohauz only wants $128. I guess I'm trying to justify saving a bit, since I'm pretty exhausted pouring money into this car.
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#4 (permalink) Old 11-01-2011, 12:15 PM
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Has anyone had experience with Febi front end parts?
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#5 (permalink) Old 11-01-2011, 03:06 PM
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I promise to stop bothering everyone, but I have one more question regarding this. What are the odds I can get the thrust arm removed without buying a ball joint separator? On this particular joint, has anyone had luck with the trusty pickle fork?
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#6 (permalink) Old 11-01-2011, 03:45 PM
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your not bothering... that is what we are here for....

if you dont have the "proper" joint seperator you can use a pickle to seperate, and I only say that because you are replacing the aluminium arms. The steering knuckle is cast so you can't damage that as easily. The reason they recommend using the joint sperator is to avoid damage to the softer aluminium parts... such as the lateral arms. But again you are replacing them so if you scare them up using the fork no biggie.
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#7 (permalink) Old 11-01-2011, 04:25 PM
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dmarti02: No bother at all. I actually enjoy helping whenever I can.

I have not used Febi but did use Lemforder lower arm, they seem to be holding up good. I did notice one thing though, when I took off the set screw to separate the strut from the ball joint, I saw that the set screw dug into the area where set screw holds the top of the ball joint. Checked the old ball joint on the original arm and that was not evident at all.

I've always read that the rubber and the ball joint materials are inferior to the Genuine Mercedes arms and it seems to be true in my experience. Febi control arm is a lot cheaper then the Lemforder, I don't know if the quality is there.

If you're not keeping the car more than couple of more years, Febi might make sense.

You could also barrow the ball joint separator from either Advance Auto or Autozone, no charge.

Below is the DIY for the front lower control arm.
Attached Files
File Type: pdf w220_TorqueStrut.pdf (302.3 KB, 324 views)

Last edited by xexpo; 11-02-2011 at 05:10 AM. Reason: edit
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#8 (permalink) Old 11-01-2011, 08:03 PM
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I would stick with OEM.. The BMW gang hasn't had the best luck with Lemforder..
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#9 (permalink) Old 11-02-2011, 05:11 AM
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If you're keeping the car, Genuine Mercedes Benz for sure.
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#10 (permalink) Old 11-02-2011, 06:25 AM
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Thanks for the assistance. I think I'll go OEM on the this job. While I rarely keep a car that long, I usually get burned on non-OEM on the install. There are always good suppliers out there, but based on the response, this is not an area to chinze on. I still can't believe what I've invested in this front end, which included struts unfortunatly!!!
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