The brake sensor line is mainly composed of brake alarm sensor device and conductor metal wire, through the circuit and spring steel sheet, when the brake pad reaches the wear limit, the driving computer automatically judges and lights the red alarm light on the instrument panel. The use of brake sensor lines in the brake system can accurately and intuitively understand the wear of the brake pads through the automotive electronic display, which greatly helps users to understand the condition of the car in time, timely and accurate maintenance of the brake system, and reduce the probability of accidents.