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What is the water content in brake fluid?

1 Answers

RafaelMarie

07/30/25 1:16am

Under normal circumstances, the water content in brake fluid should be below 1%. If it is too high, it will lower the boiling point of the brake fluid, causing the brake fluid to boil and vaporize during high-intensity braking, leading to brake failure. When the water content in brake fluid reaches 3%, the boiling point of the brake fluid will decrease by 25%. If the water content reaches 7-8%, the boiling point of the brake fluid will drop by more than 50%. The relevant details about brake fluid are as follows: Introduction to brake fluid: Brake fluid is also known as hydraulic brake fluid. The water content in brake fluid has a certain limit, and when it exceeds this limit, the brake fluid must be replaced promptly. Brake fluid itself is hygroscopic, meaning moisture from the air can seep into the brake fluid through the vent hole of the brake fluid reservoir. Over time, this can cause the water content in the brake fluid to exceed the standard. Functions of brake fluid: It effectively lubricates the moving parts of the braking system, extending the service life of brake calipers and rubber cups.

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