Original American cars and European cars generally use low-metal formulas, and Japanese cars use Nao formulas. Domestic ceramic formulas are too hard to use, and the friction coefficient is not high. It is marked 0.4, but it may actually be only 0.38. Not bad. If you install it, the braking performance may not be as good as the original one. The key is that it is too hard and the brake pads will not be consumed, and the brake disc will be over-consumed. Maybe if you use a set of pads, your disc may say goodbye to you. This kind of brake The appearance is that it does not shed powder or stain the rim, and the brake pads are particularly durable. Nowadays, semi-metal and low-metal formulas are gradually being phased out because of environmental pollution and relatively serious thermal attenuation. However, the friction coefficient is high, and major brands are basically around 0.44. The Nao formula is an early semi-metallic material that is biased toward ceramics. It has good heat decay resistance and the friction coefficient can reach 0.4-0.42, which is slightly lower than the semi-metallic friction coefficient. This is why everyone intuitively feels that the brakes of Japanese cars are soft. Now with the birth of the third-generation composite ceramic formula developed by Raybesto, many European cars have begun to abandon the semi-metallic formula, because the new composite ceramic formula has a friction coefficient of 0.5 and almost no thermal attenuation. At the same time, It is also more environmentally friendly, because this technical formula is currently not available in other international brands, and in order to adapt to high-temperature and high-intensity environments, the connection between the friction material and the backing plate is different from the glue bonding of traditional brake pads. Instead, it uses barbed physical connections with complex processes, so the cost of processing is higher, which is reflected in the product price which is much higher than that of traditional brake pads, which is difficult for ordinary car owners to accept