The difference between disc brake and drum brake

Drum brake:  high braking force but poor heat dissipation
The working principle of a drum brake is very simple. It is composed of brake soleplates, brake cylinders, brake shoes, and other related connecting rods, springs, pins, and brake drums. By hydraulically pushing the piston, the brake shoes on both sides are tightly pressed against the inner wall of the wheel, thereby achieving the braking effect. The drum brake structure is closed and not easily damaged, with a solid quality and low cost. Moreover, the most important thing is that the braking force is also very large. Similarly, due to the closed structure, the heat dissipation of the drum brake is relatively poor. During the use of the brake, the brake pads will violently rub against the brake drum, and the generated heat is difficult to eliminate in a timely manner. Once the time is too long, it will cause the brake overheating performance to decline, and even burn the brake shoes, resulting in the loss of braking force. To solve this problem, many card enthusiasts choose to install a water sprayer on their cars, spraying water to the drum brake to cool down when facing long downhill slopes, in order to avoid thermal decay.

Disc brake: not afraid of heat attenuation, but relatively expensive in cost
The disc brake mainly consists of components such as the brake wheel cylinder, brake caliper, brake pads, and brake discs. The overall structure is simple, with fewer components, and the braking response speed will be very fast. The working principle of disc brake and drum brake is actually similar, but the difference is that it uses a hydraulic pump to push the brake caliper to clamp the brake pads and generate friction, thereby achieving braking effect.

So from a structural perspective, the disc brake will be more open, so the heat generated by the friction between the caliper and the brake pads during the braking process will be easily released. Even if subjected to continuous high-speed braking, the braking performance will not experience excessive thermal decay. Moreover, due to the open structure of the disc brake, maintenance and upkeep will be more convenient. It should also be mentioned here that disc brakes cannot be soaked in water, as it can cause the brake pads to crack.