1. Appropriate friction coefficient. The friction coefficient is the most basic parameter of the friction material, which determines the basic braking torque of the brake pad. The national standard strictly requires manufacturers to indicate the coefficient of friction on the packaging. The friction coefficient must be appropriate. Too high will cause wheel lock, direction loss and burning during braking, and too low will result in too long braking distance. For example, the friction coefficient of Bosch safety brake pads is 0.39.

2. Reliable security. Brake pads will generate instantaneous high temperature when braking, especially at high speed or emergency braking. At high temperature, the friction coefficient of the friction plate will decrease, which is called thermal recession. The level of thermal decay determines the safety in high temperature conditions and emergency braking.

3. Satisfactory comfort. Comfort is a direct reflection of friction performance, including braking feel, noise, dust, smoke, odor, etc. With the increase of private cars and the improvement of people's living standards, on the basis of satisfying the basic premise of safety, comfort has increasingly become an important indicator of friction plates.

Among the comfort indicators, car owners are often most concerned about the noise of the brake pads. In fact, noise is also the most difficult problem for all friction material manufacturers to solve. The noise is caused by the abnormal friction between the friction plate and the friction disc. The reasons for the noise are very complicated. The braking force, the temperature of the brake disc, the vehicle speed and the weather conditions may all be the causes of the noise.

In addition, the causes of noise are different in the three different stages of brake initiation, brake implementation and brake release. If the noise frequency is between 0 and 500Hz, it will not be felt in the car, but if it exceeds 1500Hz, the car owner can clearly feel the braking noise.

4. Reasonable longevity. Service life is a product indicator that everyone is generally concerned about. Usually the brake pads can guarantee a service life of 30,000 kilometers. Large particles of graphite and brass, like those used in Bosch brake pad materials, also reduce disc wear.