Automobile brake system composition 1, control system (pedal, hand brake, etc.); 2, hydraulic system (hydraulic oil, brake master cylinder, hydraulic oil pipe, brake cylinder); 3, power assist system (vacuum booster pump); 4, electronic control System (ABS pump, ABS sensor, ABS computer); 5, execution system (brake caliper, brake pad, brake disc).
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Disc brake
Due to the dramatic increase in the performance and speed of the vehicle, in order to increase the stability of the brakes at high speeds, the disc brakes have become the mainstream of the current brake system. Since the brake disc of the disc brake is exposed to the air, the disc brake has excellent heat dissipation. When the vehicle is braked at a high speed or braked for a short time, the performance of the brake is less likely to decline, and the vehicle can be obtained. Better braking effect to improve vehicle safety. And because of the fast response of the disc brakes, the ability to do high-frequency braking action, many models use disc brakes with ABS system and VSC, TCS and other systems to meet the needs of such systems need to be fast.
The mode of action of the disc brake: the disc brake uses a static brake disc to clamp the brake disc that rotates with the upper tire to generate friction, so that the wheel will rotate at a lower speed. When the brake pedal is depressed, the piston in the master cylinder is pushed and pressure builds up in the brake circuit. The pressure is transmitted to the piston of the brake cylinder on the brake caliper via the brake oil. After the piston of the brake cylinder is under pressure, it will move outward and push to force the piece to clamp the brake disc, so that the sheet and the brake disc are rubbed. In order to reduce the wheel speed, let the car slow down or stop.
Advantages of disc brakes:
1. The heat dissipation of the disc brake is better than that of the drum brake. When the brake is continuously stepped on, the brake will not be degraded and the brake will be out of order.
2. The change in size of the brake disc after it is heated does not increase the stroke of the brake pedal.
3, the disc brake system has a fast response, can do high-frequency brake action, and thus more in line with the needs of the ABS system.
4, disc brakes do not have the automatic brake function of the drum brakes, so the brake force of the left and right wheels is relatively average.
5. Because the brake disc has better drainage, it can reduce the brakes caused by water or sediment.
6. Compared with the drum brake, the disc brake has a simple structure and is easy to maintain.
Disadvantages of disc brakes:
1. Because there is no automatic brake function of the drum brake, the brake force of the disc brake is lower than that of the drum brake.
2. The friction area between the disc brake disc and the brake disc is smaller than that of the drum brake, so that the braking force is also relatively small.
3. In order to improve the shortcomings of the above disc brakes, a large pedaling force or oil pressure is required. Therefore, it is necessary to use a brake disc having a larger diameter or to increase the oil pressure of the brake system to increase the power of the brake.
4. The hand brake device is not easy to install. Some models with rear brakes using disc brakes are equipped with a set of hand brake mechanisms for drum brakes.
5. The wear of the film is large, and the replacement frequency may be high.
Judgment of brake failure
The feeling of braking is very important. When the normal brake system brakes, the pedal feels solid and the car should immediately stop in a straight line. When the vehicle is severely shaken or slanted to one side, or feels that the pedal response is insensitive and soft, it should be taken seriously by the owner. Some screams are caused by the interaction of the friction lining with the gasket on the back. Slight screams at low speeds without the use of brakes are due to wear on the brake disc or sheet edge. In addition, if the brake temperature is too high, there will be smoke and odor when it exceeds 400 degrees, and the brake will be noticeably soft, which is caused by the continuous use of the brake system for a long time.
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