Simple is better. Many cyclists have asked about the difference between V-brakes and disc brakes.

    Disc brakes work by using brake calipers to clamp onto a steel disc attached to the wheel hub.

　　Both disc brakes and V-brakes reduce speed by applying force to an object and generating friction. The biggest difference lies in the fact that V-brakes use brake pads to grip the bike’s rim, while disc brakes feature dedicated brake discs, using brake pads inside the caliper to create friction pressure on the disc for braking.

　　Among sports bicycle disc brakes, there are primarily two types: mechanical disc brakes (cable-actuated) and hydraulic disc brakes.

　　Mechanical disc brakes rely on the tension of the brake cable to make the brake pads (also called brake shoes) rub against and clamp the disc, creating the braking effect. Hydraulic disc brakes use fluid as the medium. When you apply force to the brake lever, it actuates pistons inside the system to compress the fluid. This pressure travels through the hose directly to the caliper, pushing the pistons inside the caliper to clamp the disc with the brake pads.

　　The main difference between the two types of disc brakes lies in the transmission medium. Mechanical disc brakes use the tension of the brake cable to brake the disc, whereas hydraulic disc brakes use pressure applied to the brake fluid inside the hose, using the fluid to push the brake pads against the disc. Therefore, mechanical disc brakes are similar in principle to the more commonly used V-brakes. Apart from the disc and brake pads, most other components are interchangeable. Hydraulic brakes, however, are different—the brake lever, hose, and caliper of a hydraulic disc brake form a fully integrated set.

　　Performance Comparison Between Mechanical and Hydraulic Disc Brakes: Mechanical disc brakes transmit braking power via the brake cable, so they inevitably share some weaknesses with V-brakes: due to factors such as the cable’s length, elasticity, and friction with the housing, braking force can be lost, resulting in insufficient braking. These drawbacks can be mitigated by replacing the brake cable and maintaining proper lubrication inside the cable housing. Hydraulic disc brakes use a fluid medium (commonly DOT-standard oil or mineral oil). DOT-3 or DOT-4 oils are typically used in automotive and motorcycle disc brakes. These are formulated to counteract thermal expansion and contraction but are toxic and corrosive—they can dissolve paint but absorb moisture. Mineral oil, on the other hand, is very pure, non-toxic, and does not absorb moisture or damage paint. Its advantage is that braking power remains consistent even after prolonged use or exposure to high temperatures. Since fluid transmission requires a high level of sealing, hydraulic disc brakes experience minimal loss of braking power during operation. Compared to cables, fluid experiences less friction inside the hose, which reduces energy loss and enhances braking force. The biggest difference in performance between the two types stems from their transmission media, leading to differing braking effects. Mechanical disc brakes suffer from power loss due to various factors, resulting in reduced braking performance, whereas hydraulic disc brakes maintain optimal braking power with minimal energy loss. The reduced friction also provides a better braking feel (achieving strong braking with minimal effort).

　　Performance Comparison: Advantages and Disadvantages of V-Brakes

　　Simple structure, easy maintenance, lightweight. However, they can struggle to effectively transmit the braking force from your fingers, especially in poor conditions (e.g., wet weather). Prolonged braking is not recommended, and they are only suitable for low-intensity use (e.g., long downhill braking can cause the V-brake pads to overheat and glaze). Practical Performance:

　　Currently, V-brakes are still quite common, but they are best suited for low-intensity cycling, such as leisure rides in the city or road racing. They provide sufficient braking power while reducing the bike’s overall weight and enhancing the riding experience. However, if you’re a passionate mountain biker, you’ll inevitably encounter rough terrain and harsh conditions. In such complex environments, the weaknesses of V-brakes become apparent—prolonged braking can cause the pads to overheat and fail, or muddy and wet rims in the rain can lead to loss of braking power. Disc Brakes: Advantages and Disadvantages:

　　They are slightly heavier, have a more complex structure that is harder to maintain, and are susceptible to oil contamination and disc collisions. However, they offer stronger braking, better adaptability to harsh conditions, and more reliable performance. Practical Performance:

　　Installing disc brakes will inevitably make your bike heavier compared to V-brakes. But in exchange for the added weight, you gain much more reliable braking. Disc brakes have almost no environmental limitations—the only thing to watch out for is keeping the discs clean. Make sure they don’t get contaminated with oil, and ensure they don’t warp.

　　[Image description] From the two images above: Figure 1 shows a V-brake losing most of its braking power when covered in mud, essentially rendering it ineffective. Overall, V-brakes and disc brakes each have their pros and cons. A high-quality V-brake isn’t necessarily cheaper than a disc brake, and the V-brake’s lightweight advantage is still noteworthy in many situations. Meanwhile, disc brakes are gradually dominating the market due to their superior braking performance. It’s not accurate to simply say that V-brakes are bad or disc brakes are bad. We recommend choosing the braking system that best suits your actual needs.

　　Between mechanical and hydraulic disc brakes, if your budget allows, I recommend going forhydraulic disc brakes for bicycles. First, it’s worth noting that the performance difference between standard mechanical disc brakes and V-brakes is minimal (except for high-end mechanical disc brakes). So, if you’re only considering aesthetics, you might as well spend that money on a good set of V-brakes to ensure safer riding. At the same price point, hydraulic disc brakes generally outperform mechanical ones. It’s also worth mentioning that many cyclists think hydraulic disc brakes are hard to maintain—that’s a misconception. Most dealers will handle the installation for you when you purchase hydraulic brakes, so you don’t need to worry about that. After installation, after about 100 kilometers of use, the dealer can perform a simple adjustment (like bleeding the system or aligning the caliper). Once your hydraulic disc brakes are broken in, you can push them hard without worry—they won’t let you down. Under normal circumstances, you won’t encounter issues like poor braking or brake rub.