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The pad wear sensor resides on one side of the pad. Going in reverse probably orients the portion of the pad with the sensor a bit closer to the disc...this is a miniscule dimension, but regardless, you are due for replacement.
MB does not recommend "turning" for any reson other than slight abberations on fairly-new ones.
Most of us have a different "3-coin" rule...replace the rotors on the "third" brake pad replacement interval.
Relative to the cost of pads, the rotors are inexpensive.
Rotor replacement is a DIY...just make sure you use Loctite on the bolts when you reinstall...
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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