D1940 Brake Pads

Advantages of ceramic brake pads

The ceramic brake pad is a kind of brake pad. Compared with the general brake pad, the ceramic brake pad has good mechanical strength and physical properties and can withstand large pressure and shear force. During the braking process, the brake pads generate heat due to friction. As the working temperature increases, the friction material of the brake pads is generally affected by the temperature, and the friction coefficient begins to decrease, thereby reducing the braking effect.

Generally, the friction material of the brake pad is immature, and the friction coefficient is too high, which causes unsafe factors such as out of control, burning, scratching the brake disc during the braking process. Even if the temperature of the brake disc reaches 650 ° C, the friction coefficient of the ceramic brake pad is still about 0.45-0.55, which can ensure the vehicle has good wear resistance. The long-term use temperature is 1000 °C. This feature makes ceramics suitable for high performance requirements of various high performance brake materials, and can meet the technical requirements of high speed, safety and high wear resistance of brake pads. There is a very low thermal decay.

The reason why the new brake pads need to run in

The brake pads and brake discs of the car are consumables. When we press the brake pedal, the brake pads and brake discs of the car will gradually be consumed in the friction. When the degree of wear reaches the limit, it needs to be carried out. Replace the treatment. After replacing the new brake pads, the contact surface between the brake pads and the brake discs failed to reach effective contact, which affected the braking performance, and the so-called "unstopper" situation occurred. Therefore, after replacing the new brake pad, it is necessary to wear-in, so that the contact area between the brake pad and the brake disc is increased, so that the braking effect is better.

The newly replaced brake pads will fit better with the brake disc after running through, making the brake performance fully utilized. The commonly used methods are as follows: choose to find a place with good road conditions and few cars to run in; accelerate to 60 ~ 80km / h, lightly brake with medium power to reduce the speed to about 10-20km / h; release the brakes Cool the brake pads and the disk slightly for a few kilometers; repeat the above steps several times until you feel comfortable braking.

The reason why the friction coefficient changes

The increase in friction coefficient is caused by the roughening of the surface and the ploughing action of the captured abrasive particles. The increase in the friction coefficient of the smooth metal surface is also related to the increase of the adhesion friction component caused by the surface polishing. The decrease in the friction coefficient is mainly due to the fact that the two surfaces become smooth after being deformed by the plastic surface, resulting in a reduced furrow effect; the elastic contact which plays a major role in the adhesion component, the roughened surface or the captured abrasive particles will decrease. The true contact area, resulting in a reduced adhesion component of the friction.

The reduction of the friction coefficient is caused by the reduction of the ploughing force at the interface discharge abrasive grains, and the subsequent increase of the friction coefficient is the re-formation and capture of the abrasive grains, resulting in a new ploughing effect. The frictional force rapidly increases to a very high value in a short period of time. The main reason is that the matching material of the friction pair is not good, and all factors have an influence on its friction.