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Rears don't have sensors...their wear cycle is not as critical as the fronts.
Worn rotors can cause some squeak issues.
If you are handy and your rears still have meat on them, you can pull the pads and apply some "brake paste" to the sides that don't contact the disc. Pad movement is most often the culprit of quealing pads.
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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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