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08
2025-05
The difference between drum brakes and disc brakes
Disc brakes and drum brakes have significant structural differences.
Disc brakes and drum brakes have significant structural differences.
Disc brakes consist of a brake disc, brake pads, and a caliper. The brake pads directly contact the brake disc, and braking is achieved by applying pressure through the caliper.
Drum brakes, on the other hand, consist of a brake drum, brake shoes, and a brake lever. The brake shoes apply pressure to the inner drum surface to achieve braking.
Disc brakes have a clear advantage in terms of heat dissipation. Because the brake pads are exposed and the contact area between the brake pads and the brake disc is small, heat dissipates quickly. Even with prolonged and frequent use, brake fade or failure is unlikely.
The brake shoes in drum brakes are in an enclosed space within the brake drum, resulting in poor heat dissipation. A large amount of heat can accumulate during braking, and the brake shoes and brake drum may deform under high temperatures, leading to reduced braking efficiency.
In terms of braking force, drum brakes have greater braking force than disc brakes. Drum brakes can reach optimal braking state in a short time, with a large braking force range.
However, although disc brakes have slightly poorer short-term braking performance, they are more stable and comfortable. The actual braking effect is controlled by the brake pad depth, making it easier to control.
Disc brakes also outperform drum brakes in terms of water drainage.
In terms of structural complexity, disc brakes have a compact and simple structure, making maintenance and repair more convenient. Drum brakes have a relatively complex structure, but to achieve the same braking force, the diameter of the drum brake is much smaller than that of the disc brake.
The applicable scenarios are also different. Drum brakes are suitable for low-speed, light-load vehicles such as light trucks. Disc brakes are widely used in ordinary passenger cars.
The working principle of disc brakes is to use hydraulic oil to push the brake pads against the brake disc through a cylinder, generating friction to achieve braking. The braking torque is large, and the hydraulic pressure can be adjusted, allowing for stepless variation of the braking torque during operation.
Drum brakes use hydraulic pressure acting on the wheel cylinder piston inside the brake drum. The piston pushes out, bending the brake shoes or pressing the friction material on the brake shoes against the inside of the brake drum, slowing the rotation of the brake drum and axle to achieve braking.
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