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When to Replace Brake Fluid Based on Moisture Content?

1 Answers

VonLorenzo

07/29/25 7:14pm

When the moisture content in the brake fluid exceeds 3%, it needs to be replaced. Here are the specific consequences of not replacing brake fluid for an extended period: 1. Corrosion of the braking system: Brake fluid is inherently hygroscopic and prone to absorbing moisture. If not replaced for a long time, the brake fluid can corrode the braking system, posing significant safety risks. 2. Formation of vapor lock: Moisture absorption lowers the boiling point of brake fluid, which can lead to insufficient braking pressure and affect braking performance. When the temperature rises to the boiling point, the moisture in the brake fluid will vaporize, creating numerous air bubbles. 3. Clogging of the brake system: Prolonged failure to replace brake fluid allows deposits and impurities in the brake lines to cause brake system malfunctions, impairing braking performance.

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