The working principle of the brake mainly comes from friction. The friction between the brake pads and brake discs (drums) and the tires and the ground is used to convert the kinetic energy of the vehicle into frictional heat energy to stop the vehicle. A good and efficient braking system must be able to provide stable, sufficient and controllable braking force, and have good hydraulic transmission and heat dissipation capabilities to ensure that the driver's force from the brake pedal can be fully and effectively transmitted to the master cylinder. And the sub-pumps, and to avoid hydraulic failure and brake decay caused by high heat.
Brake pad replacement depends on how long your gaskets have been used in your car life. Generally, if you have a distance of more than 80,000 kilometers, the brake pads need to be replaced. However, if you hear friction from your wheels, you should replace the brake pads regardless of your mileage. If you haven't figured out how many kilometers you have exercised, you might go to a store that replaces pads for free, buy them brake pads, or install them at a car service store.
The brake drum is equipped with brake shoes, but the brake pads and brake shoes are generally referred to as the brake pads. Therefore, "disc brake pads" are used to specify the brake pads on the disc brakes. Not the brake disc.