D1322 Brake Pads

Non-asbestos friction material

In the 1960s, people gradually realized that asbestos had certain risks to human health. In the process of mining or production, fine asbestos fibers are easily infiltrated into the lungs in the air, and people who are in this environment for a long period of time are more likely to suffer from diseases such as asbestosis. Therefore, people began to look for other fiber materials that can replace asbestos to make friction materials, that is, non-asbestos friction materials or non-asbestos friction materials.

In the 1970s, semi-metallic materials using steel fiber as the main substitute material were first adopted abroad. From the 1980s to the early 1990s, semi-metallic friction materials have occupied the entire automotive disk segment. Since the late 1990s, the emergence of NAO friction materials in Europe has been a development trend. NAO type friction material helps to overcome the defects of high specific gravity, rust, easy to produce brake noise, damage to the dual and high thermal conductivity of semi-metal friction materials.

With the rapid development of the automotive industry, people are increasingly demanding braking performance and began to develop ceramic friction materials. The ceramic friction material is mainly composed of inorganic fibers and several organic fibers, no asbestos and no metal. Its characteristics are: meet environmental requirements; the use of metal-free and porous materials can reduce the density of the product, and help to reduce the viscosity of the brake disc and brake noise. The friction material does not rust and does not corrode; the abrasion is low and the dust is less.

Non-asbestos brake pad characteristics

The friction material of the non-asbestos brake pad is a special material that works in a hot and high pressure environment. Therefore, it is required that the filler component used must have good heat resistance, that is, thermal stability, including thermochemical effects of thermophysical effects. Wait. The packing density of the filler has a great influence on the performance of the friction material. The different performance requirements of the friction material also have different requirements for the packing density of the filler.

The Mohs hardness of the non-asbestos brake pad grinding filler is usually 3 to 9. The grinding effect with high hardness is remarkably obvious. 5.5 Fillers above hardness are hard fillers, but the amount and particle size should be controlled. The anti-friction filler is generally a low hardness material, lower than the Mohs hardness 2 mineral. Such as: graphite, molybdenum disulfide, talc, mica and so on. It reduces both the coefficient of friction and the wear of the dual material. Thereby increasing the service life of the friction material.

When should the non-asbestos brake pads be replaced?

The non-asbestos brake pads of a car are used as a kind of wearing parts, and the replacement time is determined according to the mileage used, the road condition, the driving habits, and the quality of the non-asbestos brake pads. Compared with the brake disc, the brake disc has a short service life, and it is generally recommended to replace the braker when the brake pad is used for 30,000-50,000 km. But more is the usual inspection, do not use the theoretical value of the brake pad to determine the timing of the replacement of the brake pad, the normality of the brake system is directly related to your driving safety.

Under normal circumstances, if the difference in thickness between the two sides of the non-asbestos brake pad on the fixed brake caliper reaches 1.5mm, the difference between the thickness of the brake pads on the floating caliper reaches 3.0mm, it needs to be replaced. However, it is impossible to accurately determine whether the brake pad is worn or not by simple external observation. It is best to use a ruler to measure the thinnest part of the brake pad to see if it is within the allowable range. Also observe whether the car alarm indicator lights up. When the brake pads are contaminated by large areas of grease or abnormal wear and breakage, they should be replaced in time.