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details Brake fluid is also known as brake fluid and there are three types。In the purchase to choose a reliable manufacturer, and the higher the grade, the better。Its brake pressure is generally 2MPa up to 4~5CPa。All liquids have the characteristics of not shrinking, in a sealed vessel or filled with liquid pipes, when the liquid is subjected to working pressure, it will quickly and evenly transfer the pressure to each part of the liquid。Hydraulic braking is the use of this basic principle to carry out work。
Brake fluid is a liquid substance that transmits brake working pressure in the hydraulic brake system of a car, which is used in the car with hydraulic brake system。
特性
Because its quality is immediately related to the reliable level of the brake, so the purchase of brake fluid is related to the personal safety of the owner, and must not be lucky。In our country, the current standard brake fluid specification GB12981-2003 "Motor vehicle brake fluid" is a mandatory specification，There are 14 performance indicators，They are appearance, equilibrium flow back melting point, wet equilibrium flow back melting point, fitness viscosity (100℃, -40℃), pH value, liquid reliability, corrosion, ultra-low temperature liquidity and appearance, volatile characteristics, water solubility, liquid phase solubility, anti-oxidation, vulcanized rubber phase solubility, travel arrangement simulation characteristics。
Several characteristics of qualified brake fluid：
1.Ensure easy transmission of braking force under high temperature, cold, high speed, cold and wet working conditions;2.No corrosion to the metal and non-metal materials of the brake system;
3.It can reasonably moisten the fitness components of the brake system and increase the service life of the brake pump and seal ring。
The characteristics of brake fluid are specified：
1, good viscosity temperature, low freezing point, ultra-low temperature circulation;2, high melting point, high temperature does not cause gas resistance;
3, the quality change in the whole process of application is small, does not cause corrosion and mildew of metal products and rubber products。
There are three types of brake fluid：
一、Castor oil - Alcohol type: It is prepared by professional castor oil 45%-55% and low-carbon energy-saving alcohol (alcohol or butanol)55%-45%, and obtained by precipitation no color or light yellow clear and transparent liquid, that is, alcohol car brake fluid.Castor oil with alcohol is alcohol type 2, castor oil with butanol is alcohol type 3.The raw material of alcohol brake fluid is very easy to obtain, the synthetic processing technology is simple, and the commodity wettability is good.The defect is that the melting point is low and the characteristics are unstable at ultra-low temperatures.Alcohol type 2 appears alcohol vapor above 45℃, resulting in gas resistance;At -25℃, castor oil precipitates as a milky white transparent liquid, and rises with the decrease of temperature, blocking the brake system and making the brake system thick and inert.In the alcohol type No. 3 sealing ring experiment, it was found that the color of the brake fluid became slightly darker, the condition of butanol slightly melted and etched vulcanized rubber, and there was white precipitation at -28℃.Some references describe in detail the addition of glycerol for regulation, but there is still settling and gradation at ultra-low temperatures.In the cold winter and hot summer, the car is not suitable for the application of alcohol type and improved alcohol type brake fluid.At present, alcohol brake fluid has been replaced by synthetic brake fluid.
二、Composite form: Made of ether, alcohol, ester and other additives, anti-oxidation, anti-rust treatment, anti-vulcanized rubber solubilization and other preservatives。
三、Ore-oil type: Made of professional light diesel fractions with thickening agents and other preservatives。Car brake fluid is a kind of multi-functional fluid used to transfer working pressure in hydraulic brake system to dissuade the rotation of vehicle wheels。Its brake pressure is generally 2MPa high to reach 4~5CPa。All liquids have the characteristics of not shrinking, in a sealed vessel or filled with liquid pipes, when the liquid is subjected to working pressure, it will quickly and evenly transfer the pressure to each part of the liquid。Hydraulic braking is the use of this basic principle to carry out work。
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