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Hi Erik,

I do not have a clue about the numbers. My truck has rear "shoes". However, in the front pads on a 123 chassis Mercedes, the pads have a drilling down into the pad for a sensor to fit into. Do you see a drilling down into the back side of the friction material that a sensor would fit into? The sensors detect a wear limit on the pad material and illuminate a warning light. The sensors themselves are likely a seperate part.
Part of the confusion with MB numbers is that they give a new part number to a different manufacturers part for the same application. In many cases with brake parts there are three or more numbers for the same part. ATE, Bendix, Lucas Girling, Brembo, Perrot etc.

-Dai
 
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