[Working principle of car brake disc]:
Car brake disc is a key component in the brake system. When the brake pedal is pressed, the friction between the brake disc and the brake pad generates resistance, which slows down and stops the vehicle.
[How to distinguish the quality of products]:
Material testing: Observe whether the material of the brake disc is uniform and fine, and whether there are obvious defects.
Surface flatness: Check whether the surface of the brake disc is flat and whether there are obvious bumps.
