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2019 Chevy Volt LT with 7.2 kW Charger
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I'm guessing a percentage indicator is using a calculation based on miles driven. I know that sensors work by wearing down with the pad until a wire is exposed setting off a dash light. But a percentage indicator seems like it's a guestimate. Otherwise, it would need to be continually measuring pad thickness.
I don't think it's going to just be miles driven, the car knows the speed, regen, and when the physical brakes are used too... so it's a little more accurate than that.
 
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