E-Class (W211) 2003-2009

What is a Thrust arm Boot?

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Old Mar 4, 2010 | 07:54 PM
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health services's Avatar
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From: socal
Exclamation What is a Thrust arm Boot?

Sorry I am not familiar with the term. It must be a german thing. My in law was quoted $1000 to replace them. I just want to see where the damage is before she says ok.

Again thanks to anyone willing to respond with the correct answer.
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Old Mar 4, 2010 | 07:55 PM
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From: Ft. Lauderdale, FL
W211 Elegance Saloon
Look underneath the car at the suspension and you will see the lower control arms (thrust arm) and a boot which covers the bushings. If the boot is torn the whole control arm should be replaced.

That price sounds about right for left and right sides

Last edited by fortlaudsummer; Mar 4, 2010 at 07:59 PM.
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Old Mar 4, 2010 | 07:58 PM
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Strange they call it that. But it is what it is.


The way they explained it to her they were going to just replace the boot itself.

I wonder if it is worth just waiting until the joint goes bad first. Same cost right?

Last edited by health services; Mar 4, 2010 at 08:11 PM.
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Old Mar 4, 2010 | 08:09 PM
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From: Ft. Lauderdale, FL
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It is part of the lower arm that helps with steering. When replaced, don't forget to have an alignment done
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Old Mar 4, 2010 | 10:38 PM
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What are the consequences of not having this changed?
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Old Mar 5, 2010 | 11:04 AM
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From: SoCal
2005 E500, 2011 ML350
Thrust arm controls caster movement of front wheels. If joint is worn, will cause uneven front tire wear and a feeling of unstability......
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Old Apr 5, 2010 | 01:38 AM
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Boy, I dunno what is with some of the dealers here in OC. The thrust arm boots are a little torn, and those joints are tight, but the lower ball joints are totally wasted.

WTF is with that?


Who trains these guys?

Last edited by health services; Apr 5, 2010 at 01:55 AM.
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