I found out that the sensor wire was rubbing against the inner wheel somehow and the wire's insulation was gone showing bare wire and causing the sensor lamp to come on. I pushed the wire back enough to brake the contact and the lamp doesn’t light anymore. Looking at the pad, it got about 4mm thickness. I believe the minimum is 2mm. anyway, I’ll be due for brake job soon here and the sensors will be replaced. G-Benz is correct my car doesn't have sensors in the rear. in any case, this show that the sensor system works! simple, but works!

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Joe95E420