The brake disc, simply put, is a round plate that turns when the car is moving. The brake caliper grips the brake disc and generates braking force. When the brake is pressed, it grips the brake disc to slow down or stop. Brake discs brake better and are easier to maintain than drum brakes
There are disc brake and drum brake and air brake, the older car is a lot of the front disc after the drum. A lot of the cars have disc brakes on the front and back. Because the disc brake is better than the drum brake heat dissipation, in the high-speed braking state, it is not easy to produce thermal decay, so its high-speed braking effect is good. But in low speed cold brake, the braking effect is not as good as the drum brake. The price is more expensive than the drum brake. So many senior cars use the overall brake, and ordinary cars use the front disc drum, and relatively low speed, and the need to stop the large truck, bus, still use the drum brake.
The drum brake is sealed and shaped like a drum. There are also many brake POTS in China. It turns when you drive. There are two curved or semi-circular brake shoes fixed inside the drum brake. When stepping on the brake, the two brake shoes will be stretched under the action of the brake wheel cylinder, and the brake shoes will rub against the inner wall of the brake drum to slow down or stop
