What is the method of choosing a car brake fluid?

The auto parts industry has always been considered a "very deep" industry, although the "war" against counterfeiting has been protracted, but the effect does not seem to be so obvious. Therefore, all kinds of fake and shoddy auto parts on the market still occupy a large position. Products that are related to the performance of the braking system, such as brake fluid, are not immune, but it is recommended to follow the following principles when purchasing brake fluid:

The color of the brake fluid is generally light yellow or dark yellow, and the friction will get hotter and hotter after dropping it in the palm of the hand. Don't choose the most cheap products, at present, the market price of dot4 brake fluid varies from 40 to 80 yuan per liter according to different brands, and some big brand products even exceed 100 yuan. If you encounter brake fluids that are much lower than the above prices, you should be careful.

Tens of thousands of kilometers to change, can you save dozens of dollars to play life, try to choose big brands such as Mobil, automotive brake system maintenance precautions, Castrol, Bosch BOSCH, AC Deke and other products, or choose the original brake fluid use inspection and problem handling.

The characteristics of the brake fluid that are truly qualified have several characteristics: that is, to ensure the flexible transmission of braking force under the conditions of high temperature, severe cold, high speed, damp 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. Therefore, it is not only related to the safety of driving that consumers choose qualified brake fluid products, but also is very important to extend the service life of the vehicle's braking system.

In January 2004, China implemented the national compulsory product standard GB12981-2003 "Motor Vehicle Brake Fluid" in line with the international general standard, and the original JG standard was no longer used. 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.

The higher the level of brake fluid, the better the safety. 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.

The HZY5 standard brake fluid is mainly used in military and motorsports, and is generally less used in civilian use, and is suitable for harsh conditions such as deserts. Western countries are very strict about the formulation of DOT standards, which cannot be achieved by simple deployment. 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.

At present, the inferior brake fluid on the market is mainly for the balance reflux boiling point is not up to standard, such products are easy to produce gas resistance, resulting in brake failure; Moreover, the kinematic viscosity of inferior brake fluid is unqualified, the viscosity is too high at low temperature and the brake is sluggish, and the viscosity is too low at high temperature, which leads to poor lubricity and serious wear of parts.

Priority is given to imported brand-name brake fluid. Most of the brake fluids sold on the market are imported brands, and the quality is reliable and easy to use. Brake fluid can be selected according to the provisions of the car instruction manual.

Ordinary cars can use DOT3 brake fluid, and more advanced vehicles can choose DOT4 brake fluid. Reasonable selection of domestic brake fluid. When using domestic brake fluid, synthetic brake fluid is suitable for cars and trucks with high-speed heavy loads and frequent braking; Alcohol brake fluid can be used on old cars with low speed and small load (such as Yuejin NJ130 and Beijing BJ130); Mineral oil brake fluid can be used in a variety of automobiles, but the brake system needs to be replaced with oil-resistant rubber parts.

No. 7 mineral oil brake fluid can be used in both winter and summer in strict areas. For what kind of domestic brake fluid to choose, please refer to the requirements of the car instruction manual.

First, the correct choice of brake fluid gradeIt is best to buy some famous brands with quality assurance; When purchasing, be sure to buy brake fluid according to the requirements of your vehicle; Because each car, its manufacturer, for the vehicle to use what brand of brake fluid is best based on data, have done experiments.

3. The color of the brake fluid is generally light yellow, transparent, and impurity-free liquidAlso, if you open it and smell it, there will generally be no peculiar smell or anything like that; If it doesn't match, don't buy it.

Fourth, find a piece of metalDrip the brake fluid onto it and bake it with fire, and the qualified brake fluid is not easy to evaporate; Put the fire close to the brake fluid, the inferior brake fluid with more methanol may ignite, while the qualified brake fluid is difficult to ignite.

5. The boiling point of the equilibrium reflux of brake fluid must not be less than 205If it's lower than this, don't buy it.

Brake fluid is also called brake fluid, if you want to judge the advantages and disadvantages of brake fluid, you should start from several attributes: the boiling point of brake fluid, kinematic viscosity, lubrication performance, anti-corrosion protection performance and adaptability to rubber. In principle, we can better choose the brake fluid by understanding the working state of the brake fluid.

Boiling point: This is the single most important indicator of brake fluid properties, as the absorption of water in the environment in which the vehicle is used is unavoidable. As the moisture in the brake fluid increases, the boiling point of the brake fluid also gradually decreases.

When the vehicle brakes, the frictional heat energy generated will heat up the brake fluid due to heat conduction, and exceed 150. When the temperature of the brake fluid exceeds its boiling point, a compressible vapor drag is created in the fluid, preventing the force applied by the brake pedal from being transmitted to the brake fluid cylinder. Therefore, in order to avoid the generation of air resistance, a good brake fluid must have a high boiling point, and the boiling point drops less after water absorption, so as to avoid brake failure due to high temperature.

Kinematic viscosity: It belongs to the second most important attribute index of brake fluid, which is what we often call high temperature viscosity and low temperature fluidity, and it is more important to look at the low temperature fluidity of brake fluid. Because low-viscosity fluids are easier to transmit pressure than high-viscosity fluids, the viscosity of a good brake fluid at low temperatures is not very thick, and the kinematic viscosity is low, so as to ensure that even in cold conditions, the pressure generated by pressing the brake pedal can be transmitted to the brakes in time to provide the best braking effect.

Lubrication: The lubrication performance of good brake fluid can avoid friction and wear in the braking system, so that the moving parts can be lubricated, reduce wear and prevent heat energy from accumulating in the system.

Anti-corrosion protection: good brake fluid can protect various metal components in the system due to the beneficial additives inside, and can prolong the life of the brake oil pump while resisting oxidation and corrosion, and the corrosion in the brake system is reduced, and the blockage in the system will be reduced, and the response speed of the brake system will not be reduced.

Adaptability to rubber: A good brake fluid must take into account the adaptability to rubber components to avoid the aging of rubber parts. In the braking system, the rubber bowl will be used to seal the brake fluid cylinder to prevent the loss of brake fluid, and a good brake fluid should avoid corrosion of the rubber bowl, and even through the addition of special substances in the brake fluid, the rubber bowl will appear slightly swollen to enhance its sealing, so as to prevent the loss of brake fluid.

Unified force synthetic brake fluid HZY4 (DOT4) Its product characteristics are: fast conduction speed, sensitive braking, HZY4 (DOT4): borate synthetic brake fluid.

It has excellent high-temperature stability and high-temperature gas resistance resistance. It has low sensitivity to water, low moisture absorption, and the boiling point is not easy to drop. Moreover, it is not easy to expand in contact with rubber, and has good compatibility.

It has excellent chemical stability and excellent corrosion protection for metal parts. This product has good low temperature fluidity at -50°C. It is suitable for all kinds of drum or butterfly braking systems that require the use of HZY4 (DOT4) products, and can be used in all seasons.

Hzy4(dot4): equilibrium reflux boiling point 255°C, wet equilibrium reflux boiling point 158°C.

The role of car brake fluid:

The brake fluid is increased by the main brake cylinder through the liquid pressure, so that the piston on the sub-cylinder on the four wheels is ejected under the action of the sealed leather bowl, and the principle of lever is used to act on the brake disc and brake pads.

Brake fluid, also known as brake fluid, comes in three types. When purchasing, you should 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.

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.

Brake fluid, also known as brake fluid, is an indispensable part of braking system. Brake fluid is a liquid medium that transmits braking pressure in a hydraulic braking system and is used in vehicles with hydraulic braking systems.

In layman's terms, you can't brake without it.

The function of brake fluid is to transmit the pressure of the brake, because most modern cars use hydraulic brakes, so the liquid of brake fluid is needed to transmit the braking force applied to the vehicle, so as to achieve the purpose of braking. Generally speaking, the replacement cycle of brake fluid is two years or 40,000 kilometers, but once the owner finds that the brake force decreases or the brake lag in daily driving, he must check the brake fluid in time, because it is likely to be caused by the deterioration of the brake oil.

There are three types of automobile brake fluids: alcohol, mineral oil and synthetic. Among them, there are 2 grades of alcohol type, No. 1 and No. 3; There are 2 grades of mineral oil type: No. 10 and No. 15. These 2 varieties have been eliminated.

At present, synthetic brake fluids are mainly used. There are three types of synthetic brake fluids: alcohol ether type, ester type and silicone oil type, but the most used are alcohol ether type and ester type. Automobile brake fluid, also known as brake fluid, is a fluid used to transmit pressure in the hydraulic braking system of automobiles.

Automobile brake fluid (hereinafter referred to as brake fluid) is an important product related to traffic safety. High-quality brake fluid not only ensures that the vehicle is not damaged, but also ensures the personal safety of drivers and passengers in case of emergency, while low-quality brake fluid is called "traffic killer".

Brake fluid, also known as brake fluid, is a functional liquid that transmits pressure in the vehicle braking system and enables the braking system on the wheels to achieve braking action, and its main role is to transmit energy, heat dissipation, anti-corrosion, anti-rust and lubrication.

The performance requirements for brake fluid are:

1. Good viscosity and temperature, low freezing point, and good fluidity at low temperature.

2. The boiling point is high, and there is no gas resistance at high temperature.

3. The quality changes little during use, and does not cause corrosion and deterioration of metal parts and rubber parts.

Extended Information: Precautions for Buying Brake Fluid:

1. Look at the viscosity and color of the product, the brake fluid is too thin to use, there is no color, transparent can not be used (generally the color of the qualified brake fluid is light yellow or dark yellow), the qualified brake fluid is obviously more viscous than water, it looks like diluted honey, and the diffusion speed is slow when poured on the glass plate.

2. The viscosity of inferior brake fluid is as thin as water, and the diffusion speed of pouring a small amount on the glass plate is fast, and you can feel that there is no consistency when you dip your fingers.

3. Comparison, cost decision, quality determination. The raw material of qualified brake fluid is mainly the basic raw material of petroleum processing - ethylene oxide, which is polymerized from ethylene oxide into polyethylene glycol monoether. This results in a high material cost for qualified brake fluid.

The brake fluid should have a high boiling point and low evaporation to reduce the generation of gas resistance.

The brake fluid has good corrosion resistance and has good adaptability to rubber parts. Automobile brake fluid, commonly known as brake oil, is a liquid used to transmit pressure in the hydraulic braking system of the automobile hydraulic braking system and the hydraulic control system of the automobile clutch in order to brake the car or make the clutch separate.

The brake fluid should have good fluidity within the operating temperature range, so that the pressure in the system can rise and fall quickly with the action of the brake pedal, and the rubber bowl can slide smoothly in the brake cylinder. Therefore, the brake fluid is required to maintain the proper viscosity over a wide range of temperatures.

How it works

Automobile brake fluid, also known as brake fluid, is a liquid used to transmit pressure in the attitude system of automobile hydraulic braking system, and its advantages and disadvantages are directly related to the reliability of brakes. The brake fluid is used under high humidity for a long time, so it is required that the brake fluid does not produce thermal decomposition and overlap, which makes the oil viscous, and does not allow the formation of sludge deposits.

There are many rubber seals and bowls in the braking system to keep the braking system completely sealed, so the brake fluid should have good adaptability to the rubber seal to prevent the rubber seals and the leather bowl from expanding and reducing the mechanical strength due to liquid oil. There are many rubber seals and bowls in the braking system to keep the braking system completely sealed, and the brake fluid should have good adaptability to the rubber seal to prevent the rubber seals and the leather bowl from expanding and reducing the mechanical strength due to liquid oil.