Brake Pad Wear Indicator Sensor. UK STCK QUICK DISPATCH! Front& Rear. ML 500 5.0 4-matic (164.175), Year of Construction 07.2005 - 12.2011, 4966, 306. ANY CONCERNS ASK FOR HELP. ML 500 5.5 4-matic (164.172), Year of Construction 12.2007 - 12.2011, 5461, 388.