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Why does the car's brake system need to change oil

Why does the car's brake system need to change oil

Jan 21,2019

Why does the car's brake system need to change oil?

Brake Fluid Introduction:

Brake oil is also called brake fluid or brake fluid. Hydraulic brake (brake) fluid is a functional liquid used in hydraulic brake systems to transmit pressure to stop wheel rotation.A brake fluid made of a refined diesel fraction with a thickener and an antioxidant. There are three types of mineral oil brake fluid, alcohol brake fluid and synthetic brake fluid. Choose a reliable manufacturer when purchasing, and the higher the level, the better. Its brake working pressure is generally 2 MPa high and can reach 4~5 MPa.


All liquids have an incompressible property, and in a sealed container or a liquid-filled line, when the liquid is subjected to pressure, the pressure is quickly and evenly conducted to conduct various parts of the liquid. Hydraulic braking uses this principle to work.

There are three types of brake fluid:

1. Castor oil-alcohol type: It is prepared by blending refined castor oil 45%-55% and lower alcohol (ethanol or butanol) 55%-45%, and obtaining a clear or transparent liquid without color or light yellow by 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 material of alcohol type brake fluid is easy to obtain, the synthesis process is simple, and the product has good lubricity; Low boiling point, unstable at low temperature. Alcohol type 1 has ethanol vapor above 45 °C, resulting in gas resistance; castor oil precipitates as milky white gel at -25 °C, and increases with temperature, blocking brake system The brake system is too heavy. In the alcohol type 3 cup test, the brake fluid color is slightly deeper, butanol slightly dissolves the corrosion of the rubber, and white precipitates are also precipitated at -28 ° C. The literature describes the addition of glycerol to adjust, but still precipitates and stratifies at low temperatures.

2. The synthetic type: with ether, alcohol, ester and other additives into the lubrication, anti-oxidation, anti-rust, anti-rubber swelling and other additives.

3. Mineral oil type: It is made by adding a thickener and other additives to the refined light diesel oil fraction.


Why does the car's brake system need to change oil?

1.Oil replacement is required every two years or 40,000 kilometers according to the car maintenance regulations.

2.The liquid brake system transmits pressure for a long time to stop the wheel from rotating, the internal oil will deteriorate, and the brake oil has water absorption characteristics. If the brake fluid cannot be replaced in time, the brake system will work abnormally, causing malfunction and accident.

3.The expired brake fluid will gradually become emulsified and deteriorate. During the emulsification process, some bubbles will be generated. These bubbles will not be released in the pipeline, and the gas transmission will affect the normal transmission of the oil pressure, resulting in a decrease in brake performance or even failure. phenomenon. In addition, the brake fluid has a strong water absorption property. After a long time, the brake fluid will cause a decrease in boiling point after water absorption, resulting in insufficient brake pressure and affecting the braking effect.


In the past, oil was changed manually, which was inconvenient to operate and time-consuming and laborious. The new generation of brake oil changer is easy to operate, convenient and practical, and the oil change speed is fast. ABS-201 is your wise choice!