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I have an 06 R350 without Airmatic that has a squatting left rear that sinks to bottom at night and never quite makes it up to normal level during driving. Compressor is new, no leaks at lines or air bellow. I am thinking it needs a replacement valve block, but I have searched many online parts stores with no luck. Anyone have a suggestion as to where to find one, without going to MB dealer? Any tips/suggestions on replacing it?
 

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The valve block is part # ..

The R360 Airmatic valve block is part : 2513200158 (aka 251 320 01 58)
Online search produces many at about $160 range. MB dealer mechanic says he can get it for me at $172 at employee rate. You can imagine where I would buy.
 

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You can't always easily detect a leak in the air springs, as it can be in the fold. Have the air springs ever been replaced? If not, they are due. It is much more likely that the issue is with the air spring than the valve.
 
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