As the performance and driving speed of the vehicle increase, the disc brake has become the mainstream of the current braking system in order to increase the stability of the brakes at high speeds. 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 be degraded, and the vehicle can be obtained. Better braking effect to improve the safety of the vehicle.
And because the disc brakes react quickly and have the ability to do high-frequency brakes, many models use disc brakes with ABS systems and VSC, TCS and other systems to meet the needs of such systems requiring fast operation.
As the name suggests, the disc brakes use a static brake disc to clamp the brake disc that rotates with the tire to generate friction and reduce the rotational speed of the wheel. 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 the brake pad to clamp the brake disc, causing the brake pad and the brake disc to rub. Reduce the wheel speed so that the car can slow down or stop.
Advantages of disc brakes:
1. The friction of the disc brake is better than that of the drum brake. When the brake is continuously pressed, the brake will not be degraded and the brake will be out of order.
2. The change in size of the brake disc after being heated does not increase the stroke of the brake pedal.
3. The disc brake system has a fast response and can perform high-frequency braking action, so it is more in line with the requirements of the ABS system.
4. Disc brakes do not have the automatic tightening action of the drum brakes, so the braking 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 drum brakes, the disc brakes are simple in construction and easy to maintain.
Disadvantages of disc brakes:
1. Because there is no automatic tightening action 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 brake pads of the disc brake 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 braking force.
4. The hand brakes are not easy to install. Some models that use disc brakes on the rear wheels add a set of hand brake mechanisms for drum brakes.
5. The brake pads are worn more, and the replacement frequency may be higher.
Difference between ventilated disc and disc
Ventilation brake discs, as the name implies, are hollow inside, and cold air can pass through the middle to cool down, which is generally used for the front wheel brake discs of civilian vehicles.
From the outside, it has many holes in the circle leading to the center of the circle. It uses the centrifugal force generated by the car during the exercise to convect the air to achieve the purpose of heat dissipation. Therefore, it is much better than the ordinary disk.
The advantages of the ventilating disk are that the heat dissipation effect is good, but the structure is relatively complicated, the manufacturing cost is high, and there is no improvement in the braking performance of the non-ventilated disk under the long-time braking. We usually use the brakes infrequently, so the disk type is more suitable for us, you What is the point of view?