What is the Difference Between Disc and Drum Brakes?

[ColeMarie]

Drum brakes and disc brakes differ in the following aspects: 1. Different shapes: Disc brake pads (also called brake discs) are divided into ordinary disc and ventilated disc types, shaped like a disc; Drum brakes have a cast iron component that closely resembles a tambourine, called the brake drum. 2. Different application scopes: Disc brakes are generally mainly used in mid-to-high-end cars, while drum brakes are usually applied in ordinary cars. 3. Different reaction speeds: The disc brake system reacts faster, while the drum brake system reacts slower.

[VonOlivia]

I've compared disc and drum brakes multiple times while driving, and I feel disc brakes are more reliable. Disc brakes have an exposed rotor that the caliper clamps directly onto, offering better heat dissipation and faster braking response, especially at high speeds or downhill where repeated braking doesn't risk overheating failure. Drum brakes, on the other hand, have an internal drum and shoes—simple in structure and low-cost, but their enclosed design leads to poor heat dissipation, making them prone to heat buildup and brake fade. Once, when I was driving an old car on mountain roads, the drum brakes gradually softened, which was quite dangerous. Disc brakes are also safer in rainy conditions as water is quickly shed, preventing slippage. Maintenance-wise, disc brakes are more expensive but last longer; drum brake parts are cheaper and can be DIY-replaced. Overall, disc brakes are better suited for daily use with higher safety margins. It's worth noting that driving habits influence the choice—aggressive drivers should avoid drum brakes.

[OEmerson]

From a cost-saving perspective, there's a big difference between disc and drum brakes. Drum brakes are cheaper, have fewer parts, and simpler maintenance – I've changed the brake shoes myself at minimal cost. Disc brakes are much more expensive, with complex discs and calipers, making repairs time-consuming and labor-intensive. However, drums are prone to overheating, especially after long-distance braking, which can reduce effectiveness and potentially lead to costly towing and repairs. Disc brakes have better heat dissipation and fewer failures, saving money in the long run. Having driven several cars, I've noticed drum brakes on rear wheels can be less stable on slippery roads, while disc brakes respond instantly with better safety. For regular commuting cars, drum brakes might suffice, but maintenance shouldn't be neglected. Don't overlook tire compatibility either – good tires can enhance braking performance. When choosing a car, balance cost and risk considerations.

[DelBella]

I've modified race cars, and disc brakes are the preferred choice. They respond quickly, have short braking distances, dissipate heat well, and don't fade under repeated hard braking on the track. Drum brakes are too sluggish and fail when they heat up—they're simply not up to the task. Discs offer precise control during aggressive driving and stability in corners. While drum brakes are cheaper, their performance is inferior. After switching from drums, my driving confidence increased significantly. It's also important to pay attention to overall chassis tuning for compatibility.