The drum brake pads on the car should be run-in for seven or eight days after replacement. Drum brake pads on vehicles are generally composed of upper and lower or front and rear brake pads. When the driver steps on the brake pedal while the vehicle is running, the two brake shoes will be pushed by high-pressure air pressure or hydraulic pressure, so that the brake pads will be opened and pressed against the brake drum. Thereby achieving the braking effect of the vehicle.