Disc brakes, also known as brake discs, are an important component of a vehicle's braking system. The working principle is explained as follows: the brake caliper controls the brake pads, which clamp the brake disc to generate friction, achieving the braking effect. This braking system has the advantages of quick heat dissipation and rapid response, and is widely used in modern vehicles. It mainly consists of the brake disc, brake caliper, and brake pads. The length of the brake disc can be customized according to the vehicle model requirements, with some reaching up to 20 centimeters, providing stable braking performance for the vehicle. In summary, disc brakes ensure driving safety with their efficient performance and are one of the key components for safe vehicle operation.

The brake disc, simply put, is a circular disc that rotates when the car is in motion. The brake caliper clamps the brake disc to generate braking force. When braking is applied, it clamps the brake disc to slow down or stop the vehicle. Heavy trucks are not suitable for using brake discs because their braking effect is not as effective as drum brakes.

Disc brakes are a common type of braking device found on bicycles or motorcycles, utilizing the friction between the brake disc and the braking device to slow down or stop the vehicle. Disc brakes are mainly divided into mechanical disc brakes and hydraulic disc brakes. They have some differences in materials and manufacturing methods, each with its own advantages and disadvantages.

In conclusion, mechanical disc brakes and hydraulic disc brakes each have their own advantages and disadvantages. Consumers can choose the appropriate braking device based on their needs and budget. When purchasing, it is recommended to consider factors such as braking effect, price, and ease of maintenance to select the most suitable type of disc brake.