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What are the main components of brake fluid?

1 Answers

TravisLynn

07/30/25 1:05am

There are three types of brake fluid, and their main components are as follows: 1. Castor oil-alcohol type: It is prepared by mixing refined castor oil and ethanol in a ratio of 1:1. In cold regions, a brake fluid composed of 13% glycerol, 34% castor oil, and 53% ethanol can still ensure normal braking at around -35 degrees, but it has a low boiling point and is prone to vapor lock. 2. Mineral oil type: It is made by adding thickeners and other additives to refined light diesel fractions. The operating temperature range is from -70 degrees to 150 degrees, and it has good performance, but the brake system must be equipped with rubber parts resistant to mineral oil. 3. Synthetic type: It is made by blending ethers, alcohols, esters, etc., with additives for lubrication, oxidation resistance, rust prevention, and rubber swelling resistance. It has excellent performance and can operate at temperatures as high as 150 degrees.

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