A brake pad sensor is a safety device designed to monitor the wear level of brake pads and alert the driver when it’s time for a replacement. These sensors are typically installed in or near the brake pads and work either mechanically or electronically. In electronic systems, once the brake pad wears down to a certain level, the sensor completes a circuit that triggers a warning light on the dashboard. This early warning helps prevent brake damage and ensures that the vehicle maintains optimal braking performance. Brake pad sensors are especially common in modern vehicles and luxury models, offering added convenience and safety by eliminating the need for frequent manual inspections. Replacing the sensor along with the brake pads is often recommended to ensure continued monitoring and system reliability.