What is the difference between disc brakes and drum brakes?
2 Answers
Drum brakes and disc brakes differ in braking methods, composition, etc. The specific differences are as follows: Different braking methods: Drum brakes use hydraulic pressure to push the brake shoes against the inner edge of the brake drum, generating friction to inhibit tire rotation and achieve braking. Disc brakes have flat brake pads on both sides of the brake disc. When hydraulic pressure from the master cylinder is delivered to the wheel cylinder, the brake pads clamp onto the brake disc to achieve braking. Different compositions: Drum brakes consist of a brake backing plate, wheel cylinder, brake shoes, related linkages, springs, brake pins, and the brake drum. Disc brakes are hydraulically controlled and mainly comprise a brake disc, wheel cylinder, brake caliper, and hydraulic lines. Different advantages and disadvantages: Drum brakes have good self-braking effects and lower manufacturing costs, but their braking system responds slower, the pedal force is harder to control, they are less suitable for high-frequency braking, and they are harder to repair. Disc brakes offer better heat dissipation, simpler construction for easier maintenance, but the brake pads wear out faster, requiring more frequent replacement.
In my daily life, I've driven cars equipped with both disc brakes and drum brakes, and the difference is quite noticeable. Disc brakes respond quickly to braking—you can feel the car slowing down immediately when you step on the pedal, with almost no delay. Especially when driving in the rain, even with wet tires, there's no slipping, making braking more stable and safer. Although drum brakes are initially cheaper to purchase, they tend to overheat—during continuous downhill driving or frequent braking, the rear drum brakes can get so hot that steam rises, leading to reduced braking efficiency and a foul smell. Maintenance is a hassle too, often requiring wheel removal to inspect the internal brake shoes, making repairs time-consuming and costly. Disc brakes, on the other hand, are more durable, dissipate heat better without needing cooldown time, though replacement parts are a bit more expensive. I think drum brakes can save some money for city driving, but for long-distance or mountain road trips, disc brakes are a must. Overall, disc brakes have shorter stopping distances, which could potentially save my life in critical moments.
