I've seen 2 causes for wiper "skip".

1) Aftermarket wiper inserts. Be sure to use the OE Bosch inserts because they are made of softer material. The aftermarket inserts are harder and last longer but tend to skip.

2) Old or bent blades that have become stiff at the pivot points. Remove your blade and check to make sure each pivot point moves easily.

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Bill Wood - Webmaster
MercedesShop.com, LLC