Automotive brake fluid, also known as brake fluid or brake fluid, is a functional fluid used in automotive hydraulic braking systems to transfer pressure and enable the wheel brakes to realize the braking effect. Since the 1930s, automobiles began to use brake fluid. Experienced a castor oil alcohol type brake fluid. Mineral oil brake fluid and synthetic brake fluid.
Castor oil alcohol type brake fluid equilibrium reflux boiling point is generally low only 80 ° high and low temperature performance is poor, high temperature use easy to produce gas resistance, low temperature use is easy to brake retardation and lead to brake failure; mineral oil type brake fluid on the adaptability of the natural rubber leather bowl is poor, easy to expand and crack accidents, and water is not compatible with a small amount of water into the high temperature is easy to produce gas resistance, affecting the transmission of braking force. Therefore, China and many other countries have basically no longer use castor oil alcohol type brake fluid and mineral oil type brake fluid.
Now the main use of synthetic brake fluid, it is mainly alcohol ether type, ester type and silicone oil type three major types, the most used is the alcohol ether type and ester type. Since the introduction of synthetic brake fluid, caused by a wide range of countries brake fluid manufacturer's interest, the U.S. Federal Department of Transportation (DOT) in 1972 proposed DOT3, DOT4.DOT5 brake fluid standards, and in order to meet the needs of the automotive industry, the requirements of the brake fluid more and more stringent, and gradually formed the SAE J-series and DOT series as a representative of the perfect synthetic brake fluid Gradually, a perfect synthetic brake fluid standard system is formed, represented by SAE J series and DOT series, which represents the technical level and development trend of brake fluid in the world today.