M-Class (W166) Produced 2012-2015

Valve stem

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Old Apr 2, 2018 | 09:31 AM
  #1  
jbarhorst's Avatar
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2018 S450 4Matic, 2020 GLE450 4Matic, 2010 S550 4Matic(sold), 2012 ML350 4Matic(sold)
Valve stem

Hi,

I have a slow leak in my valve stem on 1 wheel. The leak is between the schraeder valve stem and the locking "nut" which holds the valve/tpms in place.
I assume there is an o-ring here.

Is this an easy do-it-yourself repair, or should I take it to the dealer? I'm wondering if the valve will fall into the tire when I remove the "nut".

Thx
Tom
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Old Apr 3, 2018 | 04:10 PM
  #2  
Etienne Lau's Avatar
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From: DFW, TX
Ml350 bluetec
Originally Posted by jbarhorst
Hi,

I have a slow leak in my valve stem on 1 wheel. The leak is between the schraeder valve stem and the locking "nut" which holds the valve/tpms in place.
I assume there is an o-ring here.

Is this an easy do-it-yourself repair, or should I take it to the dealer? I'm wondering if the valve will fall into the rim when I remove the "nut".

Thx
Tom
This is not a DIY repair. If you undo the locking nut, the valve stem most likely will "fall" into the tire itself. There usually is a rubber ring that seals the TPMS(Valve Stem) against the rim.

Last edited by Etienne Lau; Apr 3, 2018 at 04:19 PM.
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Old Apr 16, 2018 | 02:07 PM
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mustbebenz's Avatar
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From: America's Mitten
on GLC300 #2, a 2022 CPO purchased b/c I really dislike the X254's UI (GL350 before those)
Probably too late for this post, but this is a job a tire shop can do without even removing the tire off the rim. A skilled technician simply lets the air out and reaches in to replace the valve by pushing through past the bead. You can buy a compatible valve on eBay for a fraction of the price the dealer charges (I run such a set on my winters) and no programming is required. If your car is no longer under warranty so that this would be a free repair to you, there's no reason to go to the dealer for a simple tire valve repair.
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