The working principle of the brake pads: When stepping on the brakes, the brake cylinders press the brake pads to make them friction with the brake discs, achieving the purpose of braking or decelerating the vehicle. During the braking process, the brake pads are inevitably worn and reach the limit of use. It needs to be replaced in time. The service life of the brake pads is related to the specific conditions of the vehicle's operating conditions (urban roads, mountain roads, etc.), driving habits, and vehicle weight. The braking force applied by the front wheel drive front brake pad is greater than that of the rear brake pad, so wear is relatively rapid. When the thickness of the brake pads is less than 7mm (including the thickness of the back plate) or the brake pads wear alarm, replace the brake pads as soon as possible. The hazard of not replacing the brake pads in time: Failure to replace them in time will cause the brake pad's steel plate to rub against the brake disc and damage the brake disc. This not only increases the maintenance cost of replacing the brake disc, but also increases the braking distance, resulting in safety hazards. The friction and overheating of the brake disc by the steel plate may also lead to brake failure, which will seriously affect the safety of driving. After replacing the new brake pads, the best braking force and normal operation of the ABS system can be guaranteed during emergency braking. Safe driving is guaranteed to avoid traffic accidents.