Should Brake Fluid Be Replaced When Water Content Reaches 4%?

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Normally, 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 fluid to boil and vaporize during high-intensity braking, which can lead 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 will drop by more than 50%. Here are some details about brake fluid: 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 naturally absorbs moisture, and over time, water from the air can seep into the brake fluid reservoir through the vent hole, leading to excessive water content in the brake fluid. Functions of Brake Fluid: It effectively lubricates the moving parts of the braking system, extending the service life of brake calipers and rubber cups.