When the brake pad is worn to the limit, the cable is disconnected and the warning lamp is on. The working principle of the brake sensor is that when the brake pads wear to the "limit" set by the brake pads for a certain time, the natural circuit is grounded and disconnected, and then the ECU turns on the alarm light due to corrosion. The brake pad alarm reminds the car owner to replace the brake pad in time; Our company provides more than 1000 types of brake alarm lines for OEM market and maintenance market, and OEM OEM OEM sales!