What makes a good brake pad?

Specifically, it can be divided into the following points: High coefficient of friction stability: In the case of high temperature, pressure and speed, the friction coefficient of the brake pad needs to be high enough and have sufficient stability.

High adhesion resistance: It does not bond with the working surface of the friction pair, and does not produce peeling, abrasion, welding and other destructive damage to the friction surface. High heat resistance:

To be able to maintain the instantaneous friction temperature rise to 900 1000 and the long-term friction temperature rise to 300 400, its mechanical properties and friction properties remain basically unchanged. High thermophysical stability: The friction material should be able to withstand frequent thermal changes, i.e. resist thermal fatigue, while also having a fairly high thermal conductivity, specific calorific value and the smallest possible coefficient of linear expansion.

Sufficient mechanical strength: The material should not produce cracks, delamination, deep cracks, spalling and detachment from the steel back; A feasible rate of wear is guaranteed. High abrasion resistance:

The wear resistance depends mainly on the operating conditions of the brake pads. For powder metallurgy material brake blades, the allowable wear amount of the UIC is cm2 mJ to ensure that the EMU brake blades have a long enough life. High environmental friendliness:

Braking should be smooth and low noise; Asbestos and lead, which are not conducive to environmental protection, cannot be added to the material; It should be able to withstand moisture for a long time and at a temperature range of 60 to 50 with strong corrosion resistance.

Material of brake pads: a Asbestos type brake pads (which have been replaced by NAO type due to carcinogenic risk) b Non-asbestos friction materials are divided into the following categories: (a) Semi-metallic friction materials, which are used in disc brake pads for cars and heavy vehicles.

Its material formula usually contains about 30% to 50% of ferrous metal (such as steel fiber, reduced iron powder, iron foam powder). Semi-metallic friction materials get their name from this. It is the first asbestos-free material to replace asbestos and develop.

Its characteristics: good heat resistance, high absorption power per unit area, large thermal conductivity, can be applied to the braking conditions of the automobile in high-speed, heavy-load operation. However, it has disadvantages such as high braking noise and brittle corners.

b) NAO friction material. Broadly speaking, it refers to non-asbestos non-steel fiber type friction materials, but the existing disc also contains a small amount of steel fibers. The base material in NAO friction materials is in most cases a mixture of two or more fibers (in the form of inorganic fibers and a small amount of organic fibers).

Therefore, the NAO friction material is a non-asbestos mixed fiber friction material. Generally, the brake pads are chopped fiber type friction plates, and the clutch plates are continuous fiber type friction plates. (c) Powder metallurgy friction materials.

Also known as sintered friction material, it is made of iron-based and copper-based powdery materials by mixing, pressing, and sintering at high temperatures. Suitable for braking and transmission conditions at higher temperatures. Such as:

Braking and transmission of aircraft, trucks, and heavy construction machinery. Advantages: long service life; Cons:

The product is high, the braking noise is large, the weight and brittleness are large, and the dual wear is large. (d) Carbon fiber friction materials. It is a type of friction material made of carbon fiber as a reinforcing material.

Carbon fiber has the characteristics of high modulus, good thermal conductivity, and heat resistance. Carbon fiber friction materials are one of the best performing among various types of friction materials. The carbon fiber friction pad has high absorption power per unit area and light specific gravity, which is especially suitable for the production of aircraft brake pads, and the brake pads of some high-end cars abroad are also used.

Because it is expensive, its application range is limited, and the production volume is small. In the composition of carbon fiber friction materials, graphite, a compound of carbon, is used in addition to carbon fiber. The organic binders in the components are also carbonized, so carbon fiber friction materials are also called carbon-carbon friction materials or carbon-based friction materials.

Replacement time: There is no definite statement on this, and the wear and tear of brake pads varies from car to car, to different car habits and road conditions. Generally, the replacement frequency of automobile brake pads is about 30,000, if the brakes are not too ruthless, the brake pads can run tens of thousands of kilometers more, basically 30,000 kilometers to check, if the brake pads are not very dangerous!

Nowadays, cars basically have brake pad warning lights, if the brake pads are thin, the instrument lights will alarm! If there is no alarm light in the low-end model, the disc brake pads can see the thickness of the friction block in the gap of the wheel, and if the shoe is almost there, it will be replaced! Is it because your car hasn't been changed because it's not worn?

That may be that the brake pads are too hard, which is not good for the brake discs, and you can consider changing to better brake pads.

You get what you pay for, don't buy too cheap, remember!! My lesson, I bought a certain accessories brand, less than 200 yuan a pair of brake pads, when loading, the master of the car repair shop said that this thing is not good, visible metal particles, after using the scraper, and then it is really like this. I'm not advertising, I'm not scolding, so what the master said should be right.

Now the performance indicators of brake pads mainly include the size of the brake pads, whether they are ventilated, etc., the top brake pads used in supercars are made of carbon porcelain materials, this kind of brake pads look like some cracks on the surface, but its performance is better than ordinary brake pads, characterized by good thermal decay resistance, wear resistance, but high cost.

The technology of brake pads is basically the same now, the brakes are now out of use, and the brake pads will also be suitable for engine braking, the latter technical requirements are a little higher, if you want to not come up with a high or low, it should be said that Volvo Cars should choose the best.

The rear wheels don't want Tammington, the original car is equipped with this, garbage, 60,000, half of the front wheels, less than one-third of the rear wheels, and the grinding disc is serious. The original factory is dusty, it is said that the ash is good, and the grinding disc that does not fall ash is not lost, but how to explain the rear wheel Tammington, both ash and grinding disc. The repair shop recommends TRW, I heard that the original front wheel is TRW, which is more durable.

Now the asbestos material has basically been eliminated. There are three main categories on the market: "multi-metal brake pads", "less metal brake pads", and "organic brake pads".

According to the actual use effect, the last category, that is, the "organic brake pad" has the best performance, such as the popular ceramic fiber brake pad.

There are two types of brake pads: metallic brake pads and carbon-ceramic brake pads. Brake pads are also called brake pads, in the braking system of automobiles, brake pads are key safety parts, and all brake effects are decisive for brake pads.

Brake pads are generally made up of steel plates, bonded insulation, and friction blocks. The working principle of brakes mainly comes from friction, using the friction between brake pads and brake discs and tires and the ground to convert the kinetic energy of the vehicle into the heat energy of friction to stop the car. A good and efficient braking system must be able to provide stable, sufficient and controllable braking force, and have good hydraulic transmission and heat dissipation capacity to ensure that the force exerted by the driver from the brake pedal can be fully and effectively transmitted to the master cylinder and each sub-cylinder, so as to avoid hydraulic failure and brake decline caused by high heat.

The most important thing in the car is the safety issue, the role of the brake in the car is irreplaceable, is an important part to protect the car and people, the brake pad is also called the brake pad, the car pad is a better brake pad? Here I will recommend a few brands for you.

The first one is definitely our big brand in China, Golden Kirin.

Shandong Golden Kirin Co., Ltd. is a national key high-tech enterprise, in China is the strongest research and development capabilities in the same industry, leading technology of auto parts export enterprises, its leading products automobiles, brake pads have more than 3,100 models suitable for almost all cars, some commercial vehicles, more than 1,000 varieties of products have obtained EU certification.

The second paragraph is our Chinese Xinyi.

Since its establishment in 1987, Xinyi has been committed to the development and production of economical and safe brake pads, and the excellent safety quality of Xinyi brake pads has been tested by the market for 20 years, and the excellent cost performance has also made him one of the most well-known brands in domestic brake pads.

The last one is Bosch in Germany.

Basically, all domestic imported cars are equipped with Dr. braking system, the name of the device can not be questioned, but in recent years, there are many domestic OEMs, and the cost performance is not high with many domestic brands, in addition to what car is installed in the use, now Bosch high-end series, the general car is not need to buy.

Fine workmanship, brake pads with high copper content, clear marking, regular, etc., this quality of brake pads is better, but it must be relatively high.

It is functional and durable, and it is easy to sprinkle at a good price.