Is it better to buy brake fluid as thick as possible or as thin as possible?

Three kinds. They are castor oil-alcohol type, synthetic type, and mineral oil type.

1. Castor oil-alcohol type: It is made of 45%-55% refined castor oil and 55%-45% low carbon alcohol (ethanol or butanol), and is precipitated to obtain a colorless or light yellow clear and transparent liquid, that is, alcohol-type automobile brake fluid. Castor oil plus ethanol is alcohol type No. 1, and castor oil plus butanol is alcohol type No. 3.

The raw materials of alcohol-type 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. Ethanol vapor appears above 45 °C in alcohol type 1, resulting in gas resistance; At -25 °C, castor oil precipitates as a milky white gelatinous substance, and increases with the decrease of temperature, blocking the braking system and making the braking system fail heavily.

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.

The situations in which the brake fluid needs to be replaced are: 1. The brake fluid absorbs water or has impurities; 2. During the normal driving of the vehicle, when the brake is light and heavy, the brake oil should be replaced in time; 3. The expansion of the leather bowl of the sub-pump is too large; 4. Brake fluid needs to be replaced every two years. The precautions for the use of brake fluid are:

1. Avoid mixing with gasoline engine oil; 2. Replace it regularly; 3. Choose good quality brake fluid.

Hello, can't be too sticky [car questions, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

Hello! Different brands of brake oil, viscosity will be different, in the case of normal indicators, of course, it is thin good, the viscosity is small, the better the fluidity, so that the pressure of the brake system can rise and fall quickly with the action of the brake pedal, I hope my answer can help you! [Car questions, ask the car master.]

4S shop professional technician, 10 minutes to solve. 】

This, according to the appropriate specifications dot3, dot4, the production date is near, the brand is large, pay attention to check the packaging tightness!

Brake fluid is an anhydrous hydraulic oil, and the general vaporization temperature is above 200 degrees Celsius, so it is relatively concentrated. If it is rare, it may absorb moisture from the air, resulting in a decrease in quality!

Nowadays, there are many colors of brake fluid, all of which are dark red, and the mineral ones are yellow, and the synthetic ones are relatively resistant to temperature.

Power Assist or Brake Fluid? The booster oil is generally in the direction of boosting, and near the generator, the small pot under the dashboard is the brake fluid.

Brake fluid can not be mixed, the requirements are not as complicated as they say, besides, hundreds of brake fluid for us to use is also a waste, cheap brake cylinder master cylinder is not blessed, use the broken when you have to change the oil. More than a dozen pieces will work for more than half a year.

Brake fluid is brake fluid, which is mainly used for heat dissipation, anti-corrosion and anti-rust, lubrication and energy transfer. There are three types of brake fluid, the first castor oil-alcohol type, which is blended by refined castor oil 45%-55% and low-carbon alcohol 55%-45%, and the second synthetic type: made of ether, alcohol, ester and other additives such as lubrication, anti-oxidation, anti-rust and anti-rubber swelling.

The third type of mineral oil: made from refined light diesel fractions with thickeners and other additives. As for the choice of brake fluid, it is best to go to the 4S store to buy the brake fluid of the original car, don't lose a lot because of a small one.

When you can't confirm whether the brake fluid has deteriorated, you can also test the moisture content of the brake fluid at a professional maintenance station, similar to using a pH test strip to measure the pH level in middle school chemistry class. The easiest way is to listen to what the people in the 4S shop say, or choose a big brand of brake fluid like Kunlun lubrication, the quality is guaranteed, you must remember that different types and different brands of brake fluid should not be mixed with different formulas, mixing brake fluid will cause a decrease in brake oil index.

Find the original brake fluid model first. Generally, the user manual will indicate the model number of the original manufacturer. You can try to find the section of technical information, pay attention to the words fuel and lubricant, and find the brake fluid column.

The model of brake fluid (i.e. brake fluid) is as follows:"dotx"The last x represents a number, commonly used are 3, 4, 5, etc., such as dot3, dot4. The higher the number, the higher the performance of the brake fluid, and of course, the more expensive. The main difference is the boiling point of the brake fluid.

As long as the family car is the same as the original or slightly higher, there is no need to use the top-of-the-line one. As for the brand, try to choose the products of well-known manufacturers, and the performance is relatively ***. Such as Valeo, Firodo, TRW and so on.

There are three types of brake fluids. 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. As much as possible, we should buy the products of manufacturers that provide supporting brake fluid for automobile factories for a long time to ensure reliable quality and stable performance, such as Kunlun, because Kunlun Lubrication is the only national key research and development project organizer in the lubricating oil industry, which is reliable.

If the brake fluid is used for a long time, the leather bowl and piston in the brake pump will be worn, and if it is not replaced in time, it will cause the brake oil to be turbid and the boiling point will drop (the brake fluid will absorb the moisture in the air, oxidation and deterioration), resulting in brake failure! Because it is impossible to drive without stepping on the brakes, it is inevitable that the braking system will wear out, so timely replacement of brake fluid is related to driving safety. The choice of brake fluid according to my personal experience mainly depends on which model your car is suitable for, the original is the best, because it is the most consistent with the traces of use of the car, and will not mix.

Or choose a big brand of brake fluid, replace the original one without mixing, so as to ensure your personal safety, a good brake fluid is still very important.

The higher the grade of brake fluid, the better the brake fluid is right. But it's not that all cars are applicable, this depends on what type of brake fluid is added to the vehicle factory, and now the car is using dot4 brake fluid when it leaves the factory. There are some old cars using dot3 or dot2 brake fluid, call Wang dig all the specific brake fluid models can look at the brake oil pot cover, and the core will be marked above.

The characteristics of the product leakage of the unified force synthetic brake fluid HZY4 (DOT4) are: fast conduction speed and 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 it 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.

There are 3 types of brake fluids, which are:

Ricinol type: blended with refined castor oil and low-carbon alcohol;

Synthetic: made of ether, alcohol and ester mixed with lubrication, anti-oxidation, anti-rust and anti-rubber swelling additives;

Mineral oil type: made by adding a thickener to a refined light diesel oil fraction.

Pick car brake fluid: Smell: Smell the smell.

Compliant brake fluid smells sweet, and inferior brake fluid smells like methanol, or artificial flavors. Second test: test the viscosity.

Qualified brake fluid is noticeably thicker than water, looks a lot like diluted honey, and diffuses slowly when poured on a glass plate. The viscosity of inferior brake fluid is as thin as water, and a small amount of it spreads quickly on the glass plate, and it can be felt that there is no consistency when you dip your fingers. Three comparisons:

Comparison**, cost decides**, **determines quality. The raw materials of qualified brake fluid are mainly ethylene oxide, the basic raw material of petroleum processing--- ethylene oxide, which is polymerized into polyethylene glycol monoether, and the current ethylene oxide monomer is relatively high. This results in a high material cost for qualified brake fluid.

Judging by the normal production cost, all 800g of brake fluid with a retail price of 18 yuan per bottle is very likely to be a substandard product, of which the retail price of about 10 yuan 800g brake fluid is 100% of the inferior methanol brake fluid products.

When choosing automobile brake fluid: 1) 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.

2) 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.

The cycle of brake fluid replacement is different for different models, and the owner's manual shall prevail.

The general family car every 40,000 kilometers or about 3 years to replace, if the car area is more rainy, to shorten the replacement cycle accordingly, you can regularly open the cabin cover, check whether the brake fluid is missing, if the brake fluid is replenished, it does not take long to appear that the brake fluid is missing, you should immediately check whether there is oil leakage.

Note that the brake fluid is corrosive to the paint and **, and should be removed in time if it hits it. Brake fluid is hygroscopic, so be sure to tighten the cap after adding brake fluid to prevent moisture from being sucked in the air.

Extended information: The brake fluid reservoir is provided with a vent, and the air sucked in from the hole contains moisture or impurities, and the moisture will be absorbed or dissolved by the brake fluid, so the boiling point of the brake fluid containing water will be reduced. When the car is driven and braked for a long time, the temperature of the braking system rises, the brake line is easy to produce air resistance, and the air is compressed, resulting in the possibility of a decrease in braking force or brake failure.

Do not mix different types and brands of brake fluid, and add specific grades of brake fluid to braking systems with special requirements. Due to the different brands and different types of brake fluid formulations, mixing brake fluids can cause a decrease in brake oil properties. 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.

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.