What is the grade of brake fluid? How many types of brake fluid are there?

There are three levels of dot, however, the current family car generally uses 4, some motorcycles can use 3, and the sports version of the car recommends 5 levels.

Brake fluid is a liquid medium that transmits braking pressure in a hydraulic braking system. Also known as brake fluid or force-oil, its English name is brake fluid, which is an indispensable part of braking system.

Used in vehicles with hydraulic braking system, its braking working pressure is generally 2MPa, up to 4 5MPa. All liquids are incompressible, and when the liquid is under pressure in a sealed container or in a line filled with liquid, the pressure is transmitted quickly and evenly to all parts of the liquid. Hydraulic brakes work using this principle.

In the braking system, it acts as a medium for force transmission, because the liquid cannot be compressed, so the pressure output from the master cylinder is transmitted directly to the sub-cylinder through the brake fluid.

Change your brake fluid every two years.

Brake fluid is critical, and it's better to change it regularly. When your car is being serviced and the oil is changing, it is best to change the brake fluid by the way;

Generally speaking, brake fluid can be divided into alcohol-type brake fluid, mineral oil brake fluid and synthetic brake fluid according to its different raw materials, process and use requirements, among which synthetic brake fluid has the advantages of low condensation point, high boiling point, not easy to produce gas resistance, anti-corrosion, etc., and is widely used in high-speed, large-load automobiles.

When the driver checks the lack of brake fluid, he should replenish the same kind of brake fluid in time, replace the brake fluid, disassemble and repair the brake pipe, brake hose, brake master cylinder or sub-cylinder, or feel that the brake pedal is too soft and there is no leakage, then due to the frequent use of existing air in the pipeline, it should be exhausted in time and the brake should be adjusted. Exhaust starts with a sub-pump away from the master pump. Here's how:

Add enough brake fluid to the brake reservoir to the highest liquid level indication, connect one end of a transparent hose with the air release screw, and the other end is placed below the brake fluid level in a transparent container, press the brake pedal several times, and when the pedal is in the depressed position, loosen the air release screw on the sub-cylinder, and tighten the air defense screw immediately after preventing the brake fluid mixed with bubbles. Repeat this until the liquid flowing out of the sub-pump no longer contains air bubbles. Finally, tighten the airproof screws, install the dust cap of the airproof screws, add brake fluid into the reservoir to the specified position, and cover the lid of the reservoir.

There are three types of brake fluid, namely: castor oil bai-alcohol type, combined du molding, and mineral oil type. When purchasing, it is necessary to choose a reliable manufacturer, and the higher the level, the better. Its braking working pressure is generally 2MPa, and the high can reach 4 5MPa.

There are several characteristics of a qualified brake fluid:

1. Ensure flexible transmission of braking force under high temperature, severe cold, high speed, humid heat and other working conditions;

2. It is not corrosive to the metal and non-metallic materials of the brake system;

3. It can effectively lubricate the moving parts of the brake system and prolong the service life of the brake cylinder and leather bowl.

1. Castor oil-alcohol type: It is made of 45%-55% refined castor oil and 55%-45% low-carbon alcohol (ethanol or butanol), and a colorless or light yellow clear and transparent liquid is obtained through precipitation, that is, alcohol-type automobile brake fluid.

Castor oil plus ethanol is alcohol type No. 1, castor oil plus butanol is alcohol type No. 3, the raw materials of alcohol brake fluid are easy to obtain, the synthesis process is simple, and the product has good lubricity; The disadvantage is that the boiling point is low and the properties are unstable at low temperatures.

2. Synthetic type: made of ether, alcohol, ester and other additives mixed with lubrication, anti-oxidation, anti-rust, anti-rubber swelling and other additives.

3. Mineral oil type: made by adding thickeners and other additives to the refined light diesel oil fraction.

Generally, brake fluid is classified according to its heat resistance, and there are currently two kinds of dot3 and dot4, which are added according to the type of car.

Nowadays vehicles mostly use DOT4 brake fluid. Some older cars use dot3 brake fluid. Therefore, different models of brake fluid have different boiling point values and different freezing points.

Moreover, different types and different brands of brake fluid should not be mixed, and specific grades of brake fluid should be added to the brake system with special requirements. Due to the different formulations of different brands and different types of brake fluids, mixing brake fluids will cause a decrease in the brake oil index. Even those brands that are better miscible and indicate that they can be mixed or substituted are not satisfactory in use, so do not use them for a long time.

1. Ricinol type, which is made of 45%-55% refined castor oil and 55%-45% low-carbon alcohol (ethanol or butanol).

2. Mineral oil type, made by adding thickeners and other additives to refined light diesel oil fractions.

3. Synthetic type, made of ether, alcohol, ester and other additives mixed with lubrication, anti-oxidation, anti-rust, anti-rubber swelling and so on.

At present, most of the brake fluids on the market are synthetic, and the alcohol and mineral oil types have been eliminated. Synthetic brake fluids are divided into three types: alcohol ether type, ester type and silicone oil type, but the most commonly used are alcohol ether type and ester type.

Automobile brake fluids are generally graded.

In January 2004, China implemented the national compulsory product standards in line with the international general standards, and according to the 2003 "Motor Vehicle Brake Fluid", the brake fluid was divided into HZY3, HZY4 and HZY5, which corresponded to the international dot3, dot4 and dot5 respectively.

Brake fluid is brake fluid, there are three types, in the purchase to choose a reliable manufacturer, and the higher the grade, the better. Its braking working pressure is generally 2MPa, and the high can reach 4 to 5MPa. All liquids are incompressible, and when the liquid is under pressure in a sealed container or in a liquid-filled line, it conducts the pressure quickly and evenly to all parts of the liquid, and hydraulic braking is beneficial.

<> "The higher the brake fluid grade, the better.

The two major maintenance points of the brake system - brake pads and brake fluid, relative to the brake pads, brake fluid (brake fluid) is one of the least concerned and understood by them, speaking of the engine, talking about fuel consumption, talking about the brand, I believe that every car lover can say a few words, but when it comes to brake fluid, it is rarely known, so it is easy to be ignored in maintenance.

The higher the brake fluid level, the better?

The answer is yes. The situation of the "National Standard for Brake Fluid" searched from the National Standards Industry Association is: in January 2004, China implemented the national compulsory product standard GB12981-2003 "Motor Vehicle Brake Fluid" in line with the international general standard.

According to GB12981-2003 "Motor Vehicle Brake Fluid", the brake fluid is divided into HZY3, HZY4 and HZY5. They correspond to international dot3, dot4, and dot5 respectively.

There are high and low levels of brake fluid, and is the higher the level of brake fluid when choosing the brake fluid, the better? Experts from Sinopec Great Wall Lubricants Company told reporters that the higher the level of brake fluid, the better the safety guarantee. In general, it is recommended to choose brake fluid that meets the HZY3 standard for mini, medium and low-end cars, while it is recommended to choose HZY4 standard brake fluid for medium and high-end cars.

Of course, there is no problem with choosing the HZY4 for mini, low-to-mid-range cars, and it is better.

Do you have to change the brake fluid in two years?

Again, the answer is yes. According to the chief engineer from Beijing Automobile Repair Company, the brake fluid has the characteristics of water absorption, and if it is not replaced for a long time, it will corrode the braking system and bring hidden dangers to the driving. He suggested that the brake fluid must be replaced once every two years or 40,000 kilometers.

The brake fluid that is truly qualified and up to standard has several characteristics: that is, it ensures flexible transmission of braking force under high temperature, severe cold, high speed, humid heat and other working conditions; It is not corrosive to metal and non-metallic materials of the brake system; It can effectively lubricate the moving parts of the brake system and prolong the service life of the brake cylinder and leather bowl. If the owner will not choose the brake He Ruyou, it is recommended that they go to a regular 4S shop to replace.

There are guarantees for the vertical beams.

Brake fluid is closely related to life?

The answer is yes. According to the researcher of the national standard for brake fluid, the quality of brake fluid is directly related to the safety of vehicle driving. Every year, nearly 100,000 people are unfortunately killed in various traffic accidents, among which vehicle brake failure and brake failure are one of its important factors.

Because of this, countries around the world have always attached great importance to the supervision of brake fluid, and Western developed countries have included it in the scope of road safety regulations to control. In China, brake fluid is subject to the national industrial product production license management. Technical experts from the Great Wall Lubricating Oil Company told reporters that Western countries are very strict on the formulation of DOT standards, which cannot be achieved by simple blending.

Many low-cost and inferior brake fluids in the domestic market are marked as meeting the DOT3 standard, but the product quality is not qualified.

There are three types of brake fluids: castor oil, mineral oil, and synthetic.

1.Ricinol type, which is a mixture of 45%-55% refined castor oil and 55%-45% lower alcohols (ethanol or butanol).

2.Mineral oil type, made from refined light diesel fractions with thickeners and other additives.

3.Synthetic type, made of ether, alcohol, ester and other additives, with lubrication, anti-oxidation, anti-rust, anti-rubber swelling and other effects.

At present, most of the brake fluids on the market are synthetic, and the alcohol and mineral oil types have been eliminated. Type A brake fluid is divided into three types: alcohol ether type, ester type and silicone oil type, but alcohol ether type and ester type are the most widely used.

Internationally, brake fluids are classified as DOT. According to the American Petroleum Institute, there are three grades of brake fluid: DOT3 (alcohol ether type), DOT4 (ester type), and DOT5 (silicone oil type).

According to China's GB12981-2003 "Motor Vehicle Brake Fluid", brake fluid is divided into three types: HZY3, HZY4 and HZY5. They correspond to international dot3, dot4, and dot5 respectively. The higher the number, the higher the level and the better the security.

It should be noted that in recent years, a new standard has emerged, which is called the high-performance brake fluid improved from DOT4.

Generally, dot3 is an alcohol ether type; dot4 is an ester; dot5 is the silicone oil type; : Modified borate type. DOT3 and DOT4 are commonly used in family cars. DOT5 is not available on the market and is generally used in racing and military.

Millions of car purchase subsidies.