Brake Pads Guide: Safety Selection Tips
In a car's safety system, brake pads are undoubtedly one of the core components, acting as the vehicle's "braking heart" and directly determining braking performance and driving safety. Whether it's low-speed braking during daily city commutes or emergency avoidance at high speeds, brake pad performance plays a crucial role.
The core function of brake pads is to convert the vehicle's kinetic energy into heat energy through friction, thereby slowing down or stopping the vehicle. Its working principle is not complicated: when the driver presses the brake pedal, the master cylinder pushes brake fluid to transmit pressure, causing the brake calipers to clamp the brake pads onto the brake disc (or brake drum). The friction between the brake pads and the brake disc prevents the wheel from rotating, ultimately achieving braking.
During this process, brake pads not only have to withstand enormous pressure but also resist the corrosive effects of high temperatures—during emergency braking, the friction temperature between the brake pads and the brake disc can instantly reach over 300°C.
High-quality brake pads must maintain stable friction performance under high-temperature environments to avoid "heat fade," a dangerous situation where high temperatures cause a sudden drop in the coefficient of friction, resulting in a significant reduction in braking effectiveness.
Currently, brake pads on the market are mainly divided into three categories, each with different characteristics and applicable scenarios. The first type is resin-based brake pads, also known as organic brake pads. Their main components include resin, fibers, and friction modifiers.
These brake pads offer significant advantages. First, they are remarkably quiet, producing minimal noise during braking, meeting the comfort needs of urban commuter vehicles. Second, they generate less dust, effectively keeping wheel rims clean.
Furthermore, they have lower manufacturing costs, resulting in excellent cost-effectiveness. However, resin-based brake pads have limited high-temperature resistance and are prone to heat fade during continuous high-intensity braking (such as on long downhill sections), making them more suitable for everyday use in ordinary family cars.
The second type is semi-metallic brake pads. Their core component is a resin-based base with the addition of metal fibers such as copper, iron, and steel. The addition of metal fibers significantly improves the brake pad's high-temperature resistance and thermal conductivity, maintaining stable braking performance even under continuous high-intensity braking conditions. They also have a longer service life and greater load-bearing capacity.
Therefore, semi-metallic brake pads are widely used in SUVs, commercial vehicles, and vehicles that frequently travel on complex road conditions. However, it also has significant drawbacks: it generates considerable noise during braking, and the metal fibers can cause some wear on the brake discs. Additionally, dust emissions are relatively high.
The third type is ceramic brake pads. As a representative of high-end brake pads, their main components include ceramic fibers, inorganic fillers, and resin. Ceramic brake pads combine the advantages of the first two types, exhibiting excellent high-temperature resistance and minimal heat fade. They also produce low braking noise, very little dust, and the dust is white or gray, making it difficult to adhere to the wheel rim, resulting in high cleanliness.
Furthermore, they cause minimal wear on the brake discs, and their lifespan is 2-3 times that of resin-based brake pads. However, ceramic brake pads are more expensive to manufacture and are primarily used in high-end sedans, performance cars, and vehicles with extremely high braking performance requirements.
For car owners, correctly selecting and maintaining brake pads is crucial for ensuring driving safety. When purchasing, it is essential to match the vehicle model and choose brake pads that conform to the original factory specifications to avoid affecting braking performance due to size or interface incompatibility.
Secondly, choose the material based on your driving habits. For daily commuting, resin-based brake pads are sufficient, while those frequently driven long distances or on mountain roads should prioritize semi-metallic or ceramic brake pads.
Furthermore, choose products from reputable brands and avoid purchasing inferior brake pads. Inferior brake pads not only have unstable friction coefficients and are prone to heat fade, but may also cause severe wear on the brake disc due to excessive impurities in the material, and even lead to fatal hazards such as breakage during braking.
