Brake Pad Wear Sensors

Is the brake wear warning on even though you have just replaced the pads, or do you want to be alerted before the friction material is worn down? Wear sensors detect when the brake pad is approaching its wear limit. This category is for you if you replace pads yourself or upgrade your brakes and need a sensor that fits your car.

What does a wear sensor do?

An electronic wear sensor is typically a small sensor with a wire and connector that sits in or next to the brake pad. When the friction material has worn down to a certain level, the sensor's contact is typically worn through, and the car can display a warning on the dashboard. Some cars instead use a mechanical metal tab that can produce a squealing noise. The sensor does not affect braking performance itself, but it can help you replace the pads in time, before metal grinds against the brake discs.

How to choose the right sensor

Fitment depends on both the car and the pad, so always check the specific part number against your car. Pay particular attention to:

• Position: front or rear axle and possibly left or right side – for example, sensors are available for both front and rear axle on several Mercedes-Benz models.
• Wire length and connector type, so the sensor reaches the car's existing connector without being stretched.
• Pad design: some pads have a cut-out for the sensor, e.g. a Brembo pad set with a sensor cut-out.
• Whether the sensor comes with the pads or must be bought separately.

In this category you will find sensors from brands such as Brembo OE, PowerStop, EBC, DFC and Stoptech. If the pads need replacing too, you will find them under brake pads.

Frequently asked questions

Should the wear sensor be replaced together with the brake pads?

It depends on the sensor type. If an electronic sensor has been worn through, it typically needs to be replaced, as it will otherwise keep triggering the warning. Many choose to replace the sensor at every pad change to avoid false warnings.

Why is the warning still on after replacing the pads and sensor?

This can be because the connector is not seated correctly, the wire is damaged, or the sensor does not fit the car. On some cars, the warning or service counter also needs to be reset after the sensor has been replaced.

Can I use a sensor from a different brand than the pads?

Often yes, if the sensor fits the car's connector and the pad design. What matters is the fitment for the specific part number, not the brand. So check that the pad has room or a cut-out for the sensor.