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Brake fluid is a hydraulic medium that transfers pedal pressure to the brake calipers and wheel cylinders. It is hygroscopic, meaning it absorbs moisture from the atmosphere over time. Contaminated fluid lowers the boiling point, risking brake fade under hard braking. Regular replacement is essential for safe braking performance.
Most manufacturers recommend a brake fluid change every two years regardless of mileage. Moisture absorption is time-dependent, not distance-dependent.
Brake fluid is classified by DOT ratings. Using the wrong specification can cause seal damage and braking failure.