Disc Brake Pad Burning Hazards and Causes
In the process of using the disc brake pads, a dangerous phenomenon occurs, that is, the brake pads are burned. So what is the hazard of the disc brakes? Why do disc brake pads appear to burn? Let's take a look at the hazards and causes of the disc brakes.
Danger of disc brake pads
The burnt film is characterized by the smoke of the disc-type brake pad, the large-scale coking and whitish, and the essence is that the lining is abnormally heated and exceeds 400 C, and it continues for a long time at this high temperature. In extreme cases, even open fires, the hazards are as follows:
1. The surface of the disc brake pad is severely coked, and the braking performance drops sharply, resulting in poor braking and increasing wear.
2. The burnt smell of the disc brake pads and the smoke will cause panic to customers and passengers, seriously affecting their confidence in the products. According to the customer complaint investigation, many customers switched to other brands of products due to the problem of burning, which caused the loss of customers and directly caused losses to the company.
3. As the overall temperature of the lining rises and exceeds the normal range, the shear strength of the material itself and the bond strength with the steel back decrease; when the brake is suddenly braked, the lining falls off and the brake fails. For the passenger bus, it involves serious life and property safety issues.
Disc brake pad burning reason
Normal brake strength and frequency, the temperature of the disc brake pads is kept at 250 ° C, the disc brake pads will not smoke, but the analysis of the returned samples shows that the temperature of these disc brake pads has reached 400 ° C or above. This is beyond the normal range of brake temperatures. This high temperature is usually only under laboratory conditions, repeated high-intensity brakes placed on the gantry, or long-term mopping; this situation A habitual explanation is that the user is used in bad road conditions, but by consulting the experienced driver, even in the steep long downhill winding road, they will not use the long-lasting continuous braking, but use the change The gearbox to the low gear, plus intermittent point brakes to achieve the speed limit, this road condition is not enough to produce high temperature; for flat road conditions, even if the shifting is frequent, the burning will not occur.
So, is there any external flammable material? We thought of the electrostatically sprayed paint powder on the disc brake pads. We tested it in the laboratory and found that when it was above 380 °C, smoke decomposition occurred, and even At 500 ° C, there is no open flame. This means that it is not related to electrostatically sprayed paint powder. Therefore, an important factor that can cause the disk brake pad to burn is the drag.
The above is about the hazards and causes of the disc brakes. I hope everyone can understand the hazards and causes of the disc brakes and it will help everyone.