2017 BMW X3 Brake Pad Wear Sensor

Choosing A Brake Pad Wear Sensor

A brake pad wear sensor must suit the brake position and electrical connection on the vehicle. Available parts include individual sensors and sets for selected front, rear or front-and-rear applications. Compare the sensor mounting end, connector and lead routing with the assembly being serviced.

A-Premium offers different package quantities and connector designs. A front sensor is not automatically interchangeable with a rear sensor, even when both are described as brake wear indicators.

How A Brake Pad Wear Sensor Works

An electronic wear sensor is associated with a brake pad and connects to the vehicle's warning circuit. As the pad wears to the point used by that system, the sensor can trigger a warning for brake inspection. Circuit designs differ, so the way a signal is generated is not identical on every vehicle.

Sensor placement is specific to the brake design, and an indicator does not replace physical inspection of the friction material.

Brake Wear Warnings And Inspection

A wear warning calls for checking the brake pads and the indicator system. Pad wear, a damaged sensor lead or a connection problem can each affect the warning on systems designed to detect those faults. Inspect both the friction material and the sensor wiring before deciding which parts are needed.

Follow the vehicle's brake service procedure for the affected axle. The replacement parts can include pads and a sensor, but their contents and service requirements depend on the application.

Frequently Asked Questions (FAQ)