Is the higher the friction coefficient of the brake pad, the better? of course not.
In general, the friction coefficient is a value that represents the amount of friction under the same pressure. The greater the friction coefficient, the greater the friction under the same pressure, and the easier it is to brake the car.
When a vehicle is driving at high speed and requires emergency braking, a too low friction coefficient will make the braking distance longer with the same pedal force, which can easily lead to accidents; and if the friction coefficient is too high, the tires will lock up, causing the vehicle to Skidding poses a serious threat to driving safety.
Part 1 : Brake pad friction coefficient standard
According to SAE standards, brake pad manufacturers will choose an appropriate friction coefficient grade, such as FF friction grade. The first letter represents the low-temperature friction coefficient, and the second letter represents the high-temperature friction coefficient.
Part 2 : Stable coefficient of friction
The coefficient of friction is the most important performance indicator of any friction material and is related to the braking ability of the brake pads.
During the braking process, friction generates heat and the operating temperature increases. The friction material of general brake pads is affected by temperature, and the friction coefficient begins to decrease.
In actual applications, friction will be reduced, thereby reducing the braking effect.
The friction material of ordinary brake pads is immature, and the friction coefficient is too high, causing unsafe factors such as loss of direction during braking, burning of pads, and scratching of the brake disc. Even if the temperature of the brake disc reaches 650 degrees
Part 3 : The coefficient grade of the brake pad ：EFGH.
The coefficient grade of the brake pad is divided into 4 levels: EFGH.
E represents a friction coefficient of 0.25-0.35. Generally, family cars will use this level, and it is mostly used on the rear wheels of two cars. Because cars are often lighter, have a lower center of gravity, and have smaller inertia, they do not need cumbersome friction coefficients.The rear wheel has a smaller task, so there is no need for a complicated friction coefficient.
F represents the friction coefficient of 0.35-0.45, which is higher. European and American styles are more commonly used.
European and American styles are generally relatively heavy and require a higher friction coefficient to brake the car more easily.
G represents a coefficient of 0.45-0.55, which is more common in German cars, probably because there is no speed limit on German highways.
H represents the friction coefficient of 0.55-0.65, which is quasi-racing grade. Competition cars will have higher friction coefficient requirements.
Part 4 :The brake pad performance
High coefficient of friction ≠ high coefficient of safety
Brake pads are generally marked with friction coefficients between 0.34 and 0.42. The market generally believes that the higher the friction coefficient, the safer it is.
Although a higher friction coefficient can often provide stronger braking force, it can sometimes have the opposite effect. Especially when the car brakes urgently at high speed, an excessively high friction coefficient may cause the wheels to lock and cause the vehicle to spin. tail and skid, causing safety accidents.
Otherwise, why would a car manufacturer install an ABS system on the car?
High friction coefficient ≠ good braking performance
The most critical factor in the braking performance of a brake pad is not how high the friction coefficient is marked on the brake pad, but how well its friction coefficient can perform under various extreme road conditions such as high speed, high temperature, water spray, winding mountain roads, and continuous sudden braking. remain stable.
Some inferior products can achieve a high friction coefficient by adding abrasive materials, but in the above emergency situations, the braking force declines rapidly and even loses the braking ability.
Too high friction coefficient affects other performance
The most basic core function of brake pads is to brake the car, but in addition, our performance requirements for noise, dust, wear and other aspects that may be caused during the braking process are also gradually increasing.
Generally speaking, if the friction coefficient of the brake pad is too high, it will increase the wear on the brake disc, causing damage to the disc and dust, and it is also more likely to cause abnormal braking noise.
At the same time, an overly sensitive foot feel will also increase the frustration when braking and affect comfort.
In conclusion
If your original car uses F, you can continue to use this grade when replacing the brake pads. After replacing E, although the brake pads and brake discs may be more durable, the braking effect will most likely be reduced.
If you replace it with a G-level or even H-level one, you may have problems with the brake disc after driving tens of thousands of kilometers, because the material of the disc you replace does not match the material of the original disc, or after replacement, the disc becomes It will be consumed very quickly, but the braking effect may be improved.
For ordinary family cars, when replacing brake pads, try to replace brake pads with the same material and friction coefficient, so you don’t have to worry that.
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