Brake Pad Frequently Asked Questions Encyclopedia Worth Collection (1)
Brake pads are the most important safety components on a car. The quality of brake pads directly affects our safety. Because of this importance, the country has a strict access system for brake pads. With the advent of the peak of car brake pad replacement, many car owners began to know and purchase the product of brake pads. As a consumer, if you want to buy original car quality products in the market, it is really a technical job to test your vision. Today, we analyze the causes of common problems of brake pads from a purely technical perspective, so that everyone can know how to choose the brake pads that suit them.
1. What is the original car package?
Answer: As the name suggests, the original car accessories are assembled on the original car when the car leaves the factory.
2. Are the products in the 4S shop matched with the original car?
Answer: As far as brake pads are concerned, not all. What we call the original car package is called OEM for short, while the 4S store is for after-sales sales, called OES for short. If possible, car owners can compare the brake assembly of the 4S shop. The above brake pads are OEM, while the individually packaged brake pads are OES. Theoretically, OES products should be produced by automobile OEM manufacturers, but in reality, the products of many 4S stores do not come from OEM manufacturers.
3. What is the difference between the original car package and the original factory package?
Answer: Theoretically, these two concepts are the same concept, and they both refer to the car accessories when the car leaves the factory. But in the real auto parts aftermarket, the original factory assembly is defined as a synonym for high imitation because of its various car factory logos.
4. Are high imitation products bad?
Answer: If it is good, it does not need high imitation.
5. What are the requirements of the automobile factory for the brake pads?
Answer: The basic requirements of the automobile factory for brake pads include 9 indicators, and these 9 indicators are required to be met at the same time. In this way, the technical indicators first meet the conditions for entering the automobile factory. Then, the automobile factory shall check the process control ability of the factory according to the TS16949 system audit standard. This point has also reached the standard, and it can enter the car factory and become the original car supporting brake pads of the car.
6. Which nine technical indicators should the original car brake pads meet at the same time?
Answer: The coefficient of friction should be stable, the service life should be long, the probability of noise should be low, the wear on the brake disc should be small, the braking ability at high temperature should be stable, the thermal expansion should be low, the compression rate must be qualified, the dust falling should be low, and the materials should be environmentally friendly. For the meaning of each indicator, you can search on Baidu "How do consumers identify that big brands of brake pads are more powerful". This article has a detailed explanation.
7. Is the larger the friction coefficient of the brake pad, the better?
Answer: No. The friction coefficient of the brake pad is designed according to the weight inertia of the car itself, which considers several technical indicators of speed, inertia, braking distance and comfort. Generally, the coefficient of friction marked on the market is between 0.34 and 0.42. However, it is actually very simple to increase the friction coefficient, just increase the abrasive agent. The car factory's criterion for judging the quality of a brake pad is not to see how big it is marked, but to see whether its friction coefficient remains stable under various extreme road conditions such as water, mountain roads, and continuous sudden braking. For many products that seem to have a high friction coefficient, their braking force will drop sharply or even lose their braking ability in the above emergency situations. Such phenomena are not uncommon.
8. How many brake pad formulas are there on the market? What are their characteristics?
Answer: The whole world is divided into three formulation systems. One is a low-metal formula, like that of Mercedes-Benz and BMW, with high friction coefficient, short life, fast grinding disc, but ultra-sensitive brakes; the other is a relatively common semi-metal formula, which is very versatile and used in American cars. Represented by the above, the friction coefficient is moderate, the normal life can reach 30,000 to 70,000 kilometers, less dust falling, and low wear on the disc. The last one is the ceramic formula, which is characterized by outstanding high-temperature braking ability, and its friction coefficient remains stable under high-temperature conditions such as continuous emergency braking and mountain downhill braking. . Ceramic formula has also become the mainstream of the later market development because of its environmental protection characteristics. As for the many high-carbon formulas and carbon fiber formulas on the market today, they should be defined by the manufacturers themselves.
9. Which of the three formulas is the best?
Answer: As far as the performance index of safe braking of the brake pads is concerned, the three formulas are all very good formulas, and all of them are acceptable. In terms of safety, social development direction, economy, and environmental protection, ceramics are superior to semi-metals, and semi-metals are superior to low-metals.
10. How to identify these three formulas?
Answer: As the name suggests, semi-metal contains nearly half of the metal fibers. You will see a lot of metal fibers on the surface, which seems to be very hard; low metal contains less metal fibers, and most of them will have large black graphite particles or other large pieces. The filler has a relatively coarse structure; the ceramic formula has a fine structure, which is generally ablated at high temperature, and the surface is carbonized, and there are many fine cracks on the side of the friction material.
