The structural characteristics of disc brakes and drum brakes are different. Now more and more passenger cars use disc brakes. More and more cars and early cars use drum brakes. With the development of science and technology, the use of disc brakes more and more, but it is not easy to think that the disc brake is better than the drum type brake.

Early car technology is not advanced now, drum brake is simpler, braking force is strong, most cars use drum brake. The brake drum rotates with the wheel when the vehicle is running. When the brake is pressed, the brake sub pump opens the spring to brake the brake pad and the running brake drum to achieve the braking effect.

The advantages of drum type brake are simple, reliable, and low cost, and big power is also a big advantage. So today, most of the truck is still using drum brake.

Of course, the shortcomings of the drum brake are also obvious, because the brake disc is in the brake drum, it is not easy to heat the heat. The brake heat attenuates easily and even the brake failure is easily caused by the frequent stepping on the brakes. Now, many accidents of overloaded freight cars are caused by the frequent use of brakes for braking attenuation failure.

When the drum brake is involved in the vehicle, the water in the brake drum should be frequently stepped out and the water friction between the brake disc and the drum should be heated up to evaporate, otherwise there will be an insensitive hidden danger.

The structure of the disc brake is more complex than the drum brake. It simply means that the brake disc is driven by the brake piston to push the brake disc and the brake disc moving together with the wheel. Although the disc brakes on the ordinary mass production car have no big congenital dynamics with no drum brake, it is easier to balance the left and right brakes, not like the drum brake to produce the brake deviation, and is more suitable for the ABS brake design. Frequent braking heat attenuation and drainage functions are all inherent in structure due to drum brake.

So even if the economic car, now most of the use of the structure of the front drum drum, let the front wheel with more braking effect to obtain more stable and reliable braking effect.

Although the braking force of disc brake is inferior to drum brake, the development space of disc brake is better than that of drum type. For those high performance sports cars, both good heat dissipation and more powerful braking efficiency are needed, four piston or six piston calipers are designed, the braking force is greater, and the brake disc is rotated. There is a ventilation tray structure with air flow through the middle to achieve better heat dissipation effect.

And for today's top F1 events, because the vehicle's weight is very light, only six hundred or seven hundred kilograms, so the disc brake is also used, but the material choice is ceramic and carbon fiber and other composite materials, working temperature can even reach about 1000 degrees.

Friends who like to watch racing cars, whether looking at F1, DTM or WRC, are deeply impressed by the red brake discs in the front rim of the car.

But do not ignore the existence of drum brake at any time. Look at the European and American truck competition. The car still uses drum brake, and it uses the automatic spray system for the brake drum to ensure the braking force and resist the heat attenuation at the same time.