Once they start making noise you're pretty much done.. You can Try injecting in w/ a large gauge needle some wheel bearing grease and covering the puncture w/ some silicone but i'd start saving for half shafts..

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
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Enthusiast Service, Restoration & Tuning.
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Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta