Brief description of brake pad friction material performance
Brake pads are friction materials fixed on the brake drum or disc rotating with the wheel, in which the friction lining and friction block bear external pressure and produce friction to achieve the purpose of vehicle deceleration. Friction blocks are friction materials that are pushed and squeezed on the brake disc by the caliper piston. As a result of friction, friction blocks are gradually worn out, and generally speaking, the lower the cost of the brake pads, the faster they wear out.
The friction block is divided into two parts: the friction material and the backing plate. The friction material can still be used after wear, but after the friction material has been used up, the backing plate and the brake disc will come into direct contact with each other, and the brake effect will be lost and the brake disc will be damaged, and the repair price of the brake disc is very expensive. The basic requirements of the brake pads are mainly wear-resistant, large coefficient of friction, excellent thermal insulation properties, good shock absorption performance but also a certain degree of noise reduction performance. According to the difference in braking brake pads can be divided into: drum brake pads and disc brake pads, according to the difference in materials brake pads can be divided into asbestos, semi-metallic type, less metal type and ceramic.
With the rapid development of modern science and technology, like other components of the braking system, the brake pads themselves have been developing and changing in recent years. In the traditional manufacturing process, the friction material used in brake pads is a mixture of various binders or additives to which fibres are added to increase their strength and act as reinforcement.
Brake pad manufacturers are often tight-lipped when it comes to the announcement of the materials used, especially new formulations, but of course, some of the ingredients such as mica, silica, and rubber fragments are publicly available. The final effect of braking, resistance to wear, temperature and other properties of ceramic brake pads will depend on the relative proportions between the different components.
