The car can drive on the road because of the rotation of the wheels，When the car is going to stop，What should I do? The driver cannot stretch the foot to the ground like the cartoon to prevent the car from moving forward，At this time, you must rely on the brake device on the car，to reduce the speed of the car and stop。

brake: As the name suggests，is a mechanical braking device that can slow down the speed，Also known as a reducer。Simply put: the car brake pedal is under the steering wheel，Step on the brake pedal，The brake leverage is connected and compressed and passed on the brake pads on the brake drum.，Make the car decelerate or stop running。Car manual brakes are next to the gear，connected to the brake bar。Common ones are bicycle brakes，It is a rod -shaped brake or a tray brake brake brake that is fixed on the frame。

The brake system hidden in the wheels，It is an important device that plays the stopping of the driving car，The brake device produces friction between the brake pads and the drum or disc，and transform the kinetic energy when driving in the process of friction to consume the kinetic energy into thermal energy。Common brake devices include two types of "drum brakes" and "disc brakes"，The basic features of their characteristics are as follows:

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Install two semicircular brake pads in the wheel hub，Use "leveraged principle" to promote the brake pads to make the brake pads contact the inner contact of the wheel drum and rub。

Drum -type brakes have been applied to the history of the car for nearly a century，But due to its reliability and powerful braking force，Make the drum brakes still configured on many models today (Mostly used in the rear wheel)。Drum -type brakes are pushed out of the brake pads installed in the brake drum through hydraulic pressure，Running the brake pads with the inside of the brake drum with the wheel rotation，The effect of braking。

The inside of the brake drum of the drum brake is the position of the brake device to generate the brake torque。In the case of obtaining the same brake torque，The diameter of the brake drum of the drum brake device can be much smaller than the brake disc of the disk -type brake。Therefore, large vehicles used in loading are to obtain powerful braking force，Only installed drum brakes in the limited space of the wheels。

Drum -type braking method

Simple to say，Drum -type brakes are the use of the static brake pads in the drums，Depending on the brake drum of the wheel rotation，The brake device with a decrease in the rotation speed of the wheels to generate friction。

When stepping on the brake pedal，The force of the feet will cause the piston in the brake total pump to push the brake oil forward and cause pressure on the oil road。Pressure is transmitted by the brake oil to the brake pump piston in each wheels，The piston of the brake sub -pump pushes the brake pads outward，Rubbing the inside of the brake pads and the brake drum，and produce enough friction to reduce the speed of the wheels，To achieve the purpose of braking。

Advantages of Drum -type brakes

1. Use automatic brakes，Make the brake system with lower oil pressure，or use a brake drum with a diameter more smaller than the brake disc。

2. The installation of hand brake mechanism is easy。Some rear wheel device disc brake models，The hand brake mechanism of the drum -type brakes will be installed at the center of the brake disk。

3. The processing and composition of parts are relatively simple，and there are relatively low manufacturing costs。

Disadvantages of Drum -type brakes:

1. The brake drum of the drum brake will increase after heating，Increasing the itinerary of stepping on the brake pedal，It is easy to have a good brake response as expected as expected。Therefore, when driving a vehicle using a drum brake，Try to avoid continuous brakes and cause brake pads to produce heat recession due to high temperature。

2. Slowly responding to the brake system，The steps of braking are less controllable，Is not conducive to making high -frequency brake movements。

3. Constructing complex parts more，The gap in the brake must be adjusted，Make it difficult to repair。

Due to the performance of the vehicle and the speed of driving and the increase of the daytime，In order to increase the stability of the vehicle's brake when driving at high speed，disc brakes have become the mainstream of the current brake system。Due to the brake discs of the disc brakes exposed to the air，Make the disc brakes excellent heat dissipation，When the vehicle does a sudden brake in a high -speed state or brake multiple times in a short time，The performance seabet ioof the brake is less likely to decline，It can make the vehicle get a better brake effect，to improve the safety of the vehicle。

and because of the fast response of the disc brakes，Affordable to make high -frequency brake movements，Therefore, many models use disc brakes and ABS systems and VSC、TCS and other system match，To meet the needs of fast movement of such systems。

Second, disc brakes:

Control two brake pads with brake calipers to pinch the brake disc on the wheels。When the brake pad is clamped,，Fiction between the two will produce。

The brake discs used in high -performance sports cars are mostly punching ventilations，Have a good cooling effect

Cold air through the wheels to cool the brake disc

Disk -type braking method method: as the name suggests，disc brakes with static brake disc，The brake discs of the tire rotated with the tire to produce friction，Make the wheel rotation speed with a low brake device。

When stepping on the brake pedal，The piston in the brake total pump will be pushed，Establish pressure on the brake oil road。Pistons are transmitted by the brake tingling pump from the brake oil to the brake caliper，The piston of the brake split pump is under pressure，Will move outward and promote the brake pad to clamp the brake disc，Make the brake pads and the brake disc rubbing，to reduce the wheel speed，Make a car slow down or stop。

The advantages of disc brakes:

1. Dip -type brake heat dissipation is better than drum -type brake，The phenomenon that will not cause the brakes when stepping on the brakes continuously。

2. The changes in size after the brake disc did not increase the itinerary of the brake pedal。

3. Fast response of the disc brake system，High -frequency brake action，Therefore, it is more in line with the needs of the ABS system。

4. The disk brake does not have an automatic effect of the drum -type brake，Therefore, the brake power of the left and right wheels is relatively average。

5. Due to the better drainability of the brake disc，It can reduce the situation of poor brakes caused by water or sediment。

6. Compared with the drum brake，Simple structure of disc brakes，and easy to repair。

Disadvantages of disc brakes:

1. Because there is no automatic brakes for drum brakes，The brake force of the disc brakes is lower than the drum -type brake。

2. The friction area between seabet mythe brake pads of the disc brakes and the brake disc is compared with the small drum brake，Make the power of the brakes smaller。

3. In order to improve the disadvantage of the above disc brakes，Therefore, it requires a greater step -stammered force or oil pressure。Therefore, we must use a brake disc with a large diameter，or improve the oil pressure of the brake system，To improve the power of braking。

4. Hand brake device is not easy to install，Some models using disc brakes using disc brakes in rear wheels add a set of drum brake hand brake mechanisms。

5. The wear of the brake pads is greater，The frequency of replacement may be higher。

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