What Kind of Oil Is Brake Fluid?

1 Answers
FrankAnn
07/29/25 12:05pm
Brake fluid, also known as hydraulic brake fluid, is the liquid that transmits force in a vehicle's braking system. Like engine oil, brake fluid is a synthetic oil blended with various additives and has strong hygroscopic properties. Brake fluid is also classified into different grades. According to the American Petroleum Institute (API) standards, brake fluid is categorized into three grades: DOT3, DOT4, and DOT5.1. Below are the specific consequences of not replacing brake fluid for an extended period: Corrosion of the braking system: Brake fluid is inherently hygroscopic and readily absorbs moisture. If not replaced for a long time, it can corrode the braking system, posing significant safety risks. Formation of vapor lock: When brake fluid absorbs water, its boiling point decreases, which can lead to insufficient braking pressure and compromised braking performance. When the temperature rises to the boiling point, the absorbed water in the brake fluid vaporizes, creating air bubbles. Clogging of the brake system: Prolonged failure to replace brake fluid allows deposits and impurities to accumulate in the brake lines, potentially causing brake system malfunctions and degraded braking performance.
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