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Old 08-08-2009, 11:01 PM   #19
blahuh
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Join Date: Apr 2009
Location: San Diego
Posts: 37
Drives: 1998 C43
There is no recommend service interval for the ABC system. For the sagging suspension problem MB says flush, then if still present, replace corresponding valve block. I personally flush or filter the ABC fluid on any repair; strut, line, valve block, etc... I also recalibrate the level stored in the ABC control module after repairs to help keep down on comebacks. Don't know if MB approves but they havent denied any claims yet so Ill keep on doing what I am doing.
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