there's 2 wear sensors. Upper one is on the outside pad and the cable to the lower one attached to the inside pad. I've searched most of the online sites and they only show the single sensor that are used in the rear.
Thank you

 

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There's only 1 wear sensor for the front.
Can be found by searching the EPC http://mbepc.net/1/fg/e/d04/212075/0/42/030#gsc.tab=0

 

Thanks for that link.
i was able to find the sensor I needed, it does have 2 sensors. See pic.