What is the difference between drum brake and disc brake?

1. Structural comparison: The principle of drum braking is to add a piston to the brake drum, and press the brake drum through hydraulic pressure to generate friction to achieve the braking effect. The disc brake, on the other hand, applies hydraulic pressure to the caliper to make the friction material clamp the brake disc, thereby achieving the braking effect.
2. Principle comparison: The principle of drum brake braking is to push the piston hydraulically so that the brake shoes on both sides are close to the inner wall of the wheel to achieve the braking effect. As the wheels move forward, the generated rolling force will react to the brake drum, causing the brake force to be amplified and affecting the comfort of the ride. Disc brakes use hydraulic pumps to push the brake calipers to apply force to the brake pads to achieve the braking effect. Therefore, the size of the brake directly depends on the pressure of the brake caliper, and will not be amplified like a drum brake, and its braking force is inherently small.
3. Comparison of advantages: The drum brake has a relatively strong braking force, and can brake the car in time when encountering a crisis, which can effectively avoid accidents. Due to the relatively large inertia of large trucks, which require relatively high braking strength, the application of drum brakes on large trucks has always been an irreplaceable position. The disc brake is an external brake system with good heat dissipation and easy control. It can be used for high-frequency spot braking or ABS spot braking.