Brake pad wear sensor: replacement and selection

When and why it is necessary to replace brake pad wear sensor

Manufacturers do not specify exact replacement terms for this component. The electronic device should be replaced in case of wire breakage or damaging of its insulation, and in case of contacts oxidation. And the plate of the mechanical sensor can break off the brake pad during car driving.

Most often, oxidation of electronic sensor elements is the result of dirt and water got onto it. And damaging of wires and their insulation is mostly caused by poor quality of the part itself or improper installation. The plate of the mechanical device can break off due to impact.

Signs of component defect vary according to its type. Thus, if the mechanical sensor was unfastened, than, specific sound, indicating pads wear-out will be absent. Incorrect data from the corresponding dashboard indicator will point out breakdown of the electronic sensor. Thus, if the unit wires are damaged, the indicator won’t be active even if the pads are significantly worn. In this case, their lifetime end can be detected by foreign sound from the wheels side, which appears at braking. Moreover, a defective device sometimes activates even when the pads are new.

It is better to replace the sensor at a service station, as a lifting device will be necessary for this. Moreover, these works presuppose demounting of the wheel. The built-in sensors are always replaced together with the pads. But even if the device is removable, many car manufacturers recommend to install it together with a new pad.