Now more and more cars use disc brakes，Drum brake is almost eliminated。Only a few vehicles will use drum brakes in the rear wheels。Some people think that this is because the brake effect of the drum brake is not as good as disc brakes。If the drum brake can basically crush the disc brake。But for home cars, the brake of the disc brake is enough，From the comprehensive performance, the disc brake is better。

Drum brake pads and brake drums have a greater contact area，Because the brake pads of the drum brake are two semi -circulars，Almost all the brake drums。Drum brake pads and brake drums have a greater contact area，So the brake pads and the brake drum cannot be fully exposed。Even if the national standard stipulates the brake pads and the brake drum contact area of ​​the drum brakes, the area of ​​the drum should not be less than 80%。And with the wear of the brake pads，The contact area will become larger and larger。

and the disc brake pads are much smaller，Limited contact area with the brake disc，Far less than the Drimpse。In the same pressure, the greater the contact area of ​​the contact, the greater the driving force。

The brake pads of the drum brake during braking will have a slight displacement，The brake pads will move with the brake drum when rubbing，This makes the brake pads can also produce an additional "wedge" effect in addition to the tight brake drum，It's like the brake pads are squeezed in the brake drum，This will provide additional braking force。

It can be seen that the drum brake is born with a strong braking force，The most common is that all kinds of large trucks are almost drum brakes，Although some car brakes are used in the front wheels, it is only used in the front wheel，The rear wheels and trailers are all drum brakes，Due to the large size of the truck，The brake system must have enough braking force to ensure the brake performance。

Nowadays, there are few drum brakes in home cars，Basically, it is the front and rear wheel disc brakes。Even if some low -profile or cheap cars are the front disc brakes and the drum brake，instead of using the drum brake。The reason why the drum brake seems to be "unwilling to see". I think there are some reasons for these aspects:

Theoretically, there are two brakes when the car brakes，One is called wheel power，is the brakes produced by the brakes to the wheel。Another called ground braking power，is the resistance of the ground on the wheel。and what really determines the brake effect is ground power。Because the brake system has a large braking power to a certain degree, the wheels start to die，Once the wheels hold the friction with the ground, it will decrease, resulting in a long brake distance。So you can simply summarize this: Only let the wheels be killed, it is enough。For household cars, disc brakes can provide enough braking force。

The disc brake system has a bright seabet mybrake disc，Calcotts with a sense of science and technology，The overall looks very advanced。Drum brakes only have one paint drum with paint，It looks stupid and ugly。Therefore, many people feel that the drum brake is not grade。

The brake pads of the drum brake were wrapped in a thick brake drum，Make a lot of heat during braking。The brake drum is exposed to the air，Heating is also said。But the brake pad is wrapped in the brake drum，Heating is a problem。If the brake pads cannot be fully braked continuously, the heat dissolution will cause the temperature to rise，to reduce the brake performance。If you are serious, you will burn the brake pad，Causes the brake failure。

Now some manufacturers use the structure of the "front -to -back drum" to save costs，That is, use disc brakes in front wheels，Drum brakes with rear wheels。The reason why this is to save money，Because the price of the drum brake is much lower than the disc brake。And the power of the rear wheels of the house is relatively small，Because the body's center of gravity moves forward，Most of the loads have been added to the front wheel brakes。Therefore, the disc brake of the front wheel can get better comprehensive effects，while the rear wheel itself is not large，Therefore, using a cheap drum brake can save a lot of money。

Relatively speaking, the comprehensive performance of the disc brake is better than the drum brake。But it cannot be said that the drum brake system is poor。Just each has its own advantages，Who is more suitable。

Source: Tencent's car 

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