Why should asbestos brake pads be banned

On November 19, 2018, the state issued a new national standard, No. In addition to some changes such as the mandatory revision of the provisions to the full text, the new GB has the following two major changes compared with the old GB in 2008:
1.The 2008 version of "technical requirements" is revised to "basic requirements related to health and safety", see Chapter 4 of the new national standard.
2. The requirement of "limit of harmful ingredients" and its test method are added. See Chapter 4 and 5 of the new national standard

Why should asbestos brake pads be banned?
The most fundamental reason for banning asbestos brake pads is that asbestos contains carcinogens and has carcinogenicity. When asbestos brake pads are rubbed, the material will release nano scale heavy metal particles, which will lead to lung cancer if inhaled into human lungs. At the same time, asbestos is also considered as an important source of air pollution. In the proportion of asbestos type brake pads, asbestos accounts for 40% - 60%. The micro particles produced by the wear of asbestos brake pads, together with vehicle exhaust, unqualified restaurant exhaust, industrial coal and other pollution sources, are the six main culprits of PM2.5.

There is another hidden danger in asbestos brake pads. Because asbestos is adiabatic, its thermal conductivity is particularly poor, usually repeated use of the brake will make the heat accumulate in the brake pad, after the brake pad becomes hot, its braking performance will change, to produce the same friction and braking force will need more times to step on the brake, this phenomenon is called "brake shrinkage", if the brake pad reaches a certain degree of heat, it will lead to brake shrinkage It doesn't work.
55 countries, including Europe, America and Australia, have banned the use of asbestos in auto parts. In 2012, about 25000 cars exported to Australia by great wall and Chery were found to contain trace amounts of asbestos, a carcinogen banned in Australia, and were recalled. Although asbestos brake pads have been banned in China since October 1, 2003, the process of asbestos free brake pads in China has been accelerated to a great extent. However, many manufacturers are still reluctant to abandon the asbestos formula because of its low cost. However, this phenomenon will end after the introduction of the new national standard in 2018. It will be officially implemented on October 1, 2019.