Original BMW Wear Sensor for Disc Brake Pads, BMW X1 xDrive28i (2023–2024)

Genuine BMW part number 34-35-6-891-421 is a brake pad wear sensor that lights the brake warning in the instrument cluster when the pads on a 2023–2024 BMW X1 xDrive28i have worn low enough to need replacement. The sensor is wired to the brake control module and supplied with 12 volts. As the pad wears down, the sensor eventually reaches the rotor. Contact with the rotor grounds the sensor and completes the circuit, and that triggers the warning light.

Original BMW Parts carry a 24-month parts warranty.

A pad wear sensor gives the driver an electrical warning so pad life does not have to be judged only by eye or by noise. Because this sensor works by touching the rotor once the pad is worn, the recommended practice is to fit a new one each time the brake pads are replaced. BMW sells it under its full name, brake pad wear sensor.

Technical Details

• Manufacturer: BMW (Genuine BMW)
• Part number: 34-35-6-891-421
• Part name: brake pad wear sensor
• Operation: 12-volt circuit from the brake control module, grounded at the rotor when the pad is worn
• Result: lights the brake pad warning in the instrument cluster
• Warranty: 24 months on Original BMW Parts

Common Questions

Should I replace the wear sensor with new brake pads?
Yes. Replacing the wear sensor at every brake pad replacement is the recommended practice.

How does the sensor turn on the warning light?
Once the pad wears down far enough, the sensor contacts the rotor. That grounds the 12-volt circuit from the brake control module and lights the warning in the cluster.

PMB Performance can match this sensor to your X1's brake service.

Fitment & Compatibility

Check the table below for the exact year, model, submodel, and any listed notes. Send your VIN and PMB Performance will confirm the fit, drawing on more than 20 years in the trade.