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Old 09-20-2001, 05:46 PM
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yal yal is offline
Join Date: Oct 1999
Location: New York, Long Island
Posts: 2,704
Basically if the front pads wear down beyond what mercedes has deemed a critical point the pad wear sensors which are connected to your pads will complete a circuit and activate an idiot light on the dash. You then should replace your front pads and have the rears inspected. Do read your manual.

What year and model do you have by the way? Is that an e420 or an s420? Let us know....
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