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The pad wear sensors start to contact the disc, completing the circuit by ground, thus setting off the light on your dash. Initially, it will just flicker sporatically, usually when you tap on the brakes, but not always.
As your pad wears further, the sensor makes complete contact and the light illuminates brightly instead of flickering.
Anyway, your sensors are telling you that your pads are nearing their maximum wear tolerances (sensors are mounted on the front pads). Under normal driving conditions, that translates to around 1500-2000 miles of pad life...plenty of time to address the issue.
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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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