How to choose brake pads

Now the brake pad aftermarket is mixed, each says its own good, and even the products we pay high prices to buy in 4S stores may be high imitation products. How do we choose?

1. Friction coefficient: Friction coefficient is simply understood as braking capacity, and its stability is a key indicator of brake pads. Stability - The car will encounter various road conditions, such as freezing weather, rainy weather, long distance down from the mountain, mountain road reciprocal uphill and downhill, emergency braking and so on, the brake pads are in cold, wet, high temperature, hot and cold alternately and high temperature condition, whether the friction coefficient can maintain stability is extremely important.

2. Service life: Extend the service life as much as possible, reduce the frequency of replacement.

3. Noise: Whether it is emergency braking or normal braking, light braking or continuous braking, it should not

produce harsh noise.

4. Comfort: That is, you plan to brake to what position when you are driving, step on the brakes by your ownfeeling, and the car just arrives at that position as you wish, and there is no noise and no shaking.

5. Thermal expansion: Both continuous braking and emergency braking will lead to high temperature expansion,which must be kept within a small range. Too much expansion will lead to too small a gap between the pads and

the pair, making the pads and discs keep braking during normal driving, which will eventually cause the oiltemperature in the brake cylinder to rise and leak, and the brakes to fail.

6. Thermal recession: The requirement of the brake pad friction coefficient of cold, hot, sour and sweet, all kinds of things, the material must adapt to a wide range of temperatures to ensure that it can not reduce its ability under

various conditions.

7. Compressibility: It reflects that when we brake with a certain braking force, the brake pads cannot be too soft or too hard. Too soft will affect the reaction time of the brake pads; too hard will hurt the disc and easily produce noise. According to the corresponding standard, the compression is roughly between 0.1~0.2mm.

8.No harm to disk: In the pair of pads and discs, this requires the pads to be worn out rather than the discs, ceramic brake pads is a very important ability is not to hurt the discs, only wear the brake pads. To wear, but also to protect the service life, to solve this contradiction requires a very high technology, and the use of more advanced materials, ceramic products high price is the reason.

Too many brake pads on the market nowadays add enough abrasive to guarantee its service life, but fail to solve the grinding disc and noise, which are the manifestation of immature formulation technology.

9. Environmental protection: Asbestos is not allowed, even if you add a trace of seafoam and other materials containing asbestos in the formula. The United States now has a proposal to gradually require the presence of copper is not allowed in the product, the introduction of these legislation, the same will promote the progress of the friction materials industry, those who do not have the ability to research and development production plants will be gradually eliminated.