ON that Mb the brake wear can come on & go back off due to the fact that the sensor has a "grounding" wire that must rub against the rotor to light that MIL light.

ON many cars including newer MB the sensor wire is a "cut-thru" system that operates the light by opening the circuit wire instead of grounding that sensor wire.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator