Brake Pad Wear Sensor: Description and Operation

2-Stage Brake Pad Wear Sensor: The 2-stage brake pad wear sensors located at the left front and right rear are monitored by the DSC control module for continuous calculation of the brake pad wear. In the first stage of wear through, the brake pad wear indicator operates in the same way as on previous models. A resistor (470 ohm) is integrated in the second wear through stage.




The control module monitors the wear status based on voltage change. The first stage of the wear indicator is activated with 6 mm (lining thickness) remaining and the second stage with 4 mm remaining.

With these two different voltages, the probable total service life of the brake pads is calculated by the DSC control module. The criteria considered by the DSC module to perform the remaining mileage calculation are: wheel speed, mileage, brake pressure, brake disc temperature and brake operating time. The remaining mileage of the brake pads can be read in the Control Display (Condition Based Service) as required.

After switching off the ignition, the calculated remaining mileage for the front and rear brake pads is stored and is the start value when the vehicle is in operation again. The service life is shown separately in the Control Display for the front axle and rear axle.