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What are the effects of high water content in brake fluid?

2 Answers

McMaci

07/29/25 4:44am

Under normal circumstances, the water content in brake fluid is 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 in brake fluid reaches 7-8%, the boiling point of the brake fluid will decrease by more than 50%. The relevant information about brake fluid is as follows: Introduction to brake fluid: Brake fluid is also known as hydraulic brake fluid. The water content in brake fluid has a certain proportion, and when the water content is too high, it must be replaced promptly. Brake fluid itself is hygroscopic, and moisture in the air can seep in 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. Function of brake fluid: It can effectively lubricate the moving parts of the braking system, extending the service life of the brake calipers and rubber cups.

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McTucker

08/12/25 8:23am

I encountered this issue during my last maintenance. The technician said brake fluid is highly hygroscopic and needs to be replaced if the water content exceeds 3%. Too much moisture can vaporize under high temperatures, creating bubbles. When you press the brake pedal, it feels spongy, like stepping on cotton, and the braking distance can increase by over 30%. Moreover, the moisture can corrode metal components—the screws on the brake calipers of my old car were pitted with small holes. The scariest part is that sudden emergency braking might fail. Last time on the highway, when the car in front braked abruptly, I almost rear-ended them because of this. Now, I strictly follow the maintenance manual and replace the brake fluid every two years—safety always comes first.

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