D1532 Brake Pads

Thermal degradation of asbestos free brake pads

There are many indicators for automotive Thermal degradation of asbestos free brake pads brake pads, and we often mention shear strength and friction coefficient. The friction coefficient of the brake pad is not a constant, but is a value that changes due to factors such as temperature, pressure, friction speed or surface state and surrounding medium. The friction coefficient is closely related to the braking force of the brake pad.

The brakes of the car generate heat due to friction, which increases the working temperature, resulting in a change in the friction coefficient of the brake pads. Temperature is an important factor affecting the friction coefficient. During the friction process, due to the rapid increase of temperature, the general temperature reaches 200 °C and the friction coefficient begins to decrease. When the temperature reaches the resin and rubber decomposition temperature range, the friction coefficient will suddenly decrease. This phenomenon is called "thermal decay". A severe "thermal decay" can result in poor braking performance and deterioration. The ideal coefficient of friction should have an ideal coefficient of cold friction and a controllable temperature decay.

In the film and television drama, we will see that the racing master stepped on the brakes and stepped on the throttle when turning at a high speed, so that the wheel starts to accelerate and the car can achieve an effective cornering speed at a suitable distance. But this is just a lens in the TV scene, showing that few people in life are stepping on the brakes and the throttle at the same time, but what happens when the step is actually taken? For the convenience of the effect, first remove the tire and show the brake pads of the car, as shown below Shown as follows:

At this point, the car tires are spinning at a rapid speed. When the brakes are lightly pressed, the Thermal degradation of asbestos free brake pads of the car will be scratched on the brake discs.

Then slowly step on the gas pedal, the speed of the wheel is getting faster and faster, and then the brakes are pressed at the same time. At this time, the scratches on the brake disc are obvious, and the brake discs start to take hot air.

In less than a minute, the brake disc continued to smoke, the color turned red, and sparks from time to time; after a while, you can see that the brake disc has completely turned red.

After a few minutes, the brake disc on the wheel exploded directly and the entire brake disc was damaged.

When the brake disc exploded, the brake pads were still rolling in smoke.

The brake discs flew out into several pieces, and it was obvious how much damage was caused by braking the brakes and the throttle at the same time.

Emergency braking precautions

When the vehicle is on the road, it will inevitably encounter some unexpected situations. When we encounter an unexpected situation, it is essential to emergency braking. At this time, we must force the brake pedal. A long time ago, the vehicle did not have an ABS system. When the brakes were suddenly braked, the wheel lock could be deviated. Now the ABS system is basically the standard configuration of the vehicle, so there is no need to worry about the wheel lock during emergency braking.

Emergency braking is to fully step on the brake pedal. Although the vehicle is basically equipped with the ABS system, it is necessary to use the emergency brake carefully on some roads. The first is dirt road or floating sand road. The brakes on these roads are still dangerous. Not only rural roads, but also some urban asphalt roads. Due to urban construction, there will be some floating soil or sand on the road. Be careful to use the brakes at this time. . The second is the rain and snow weather, the rain and snow weather will reduce the friction of the road, and the vehicle will slip, etc., so we need to drive carefully to avoid emergency braking.