Functional description

The brake pad wear sensor is a sensor with a resistance measurement.

The brake pad wear sensors (front left and rear right on the inner brake pads) provide additional information on the thickness of the brake pad.

2-stage brake pad wear sensor:  This additional information (2 data points) is compared to the value calculated by the DSC for rear wear. The data points are at approx. 6 mm and 4 mm. The wear limit of the brake pad is 3.7 mm.

1-stage brake pad wear sensor:  When the conductor path is worn through, approx. 5 % of the remaining brake pad thickness is reached. This corresponds to a remaining distance of approx.

Courtesy of BMW OF NORTH AMERICA, INC.

Shown: 2-stage brake pad wear sensor:

A critical brake pad thickness is indicated in the instrument cluster by the service interval indicator (Condition Based Service CBS) as well as the general brake warning light in red.