Car brake fluid is hygroscopic, meaning it naturally absorbs moisture from the air over time. Even in a sealed system, brake fluid can absorb 2-3% water within two years, which lowers its boiling point from around 230°C to potentially below 150°C. When you brake hard going down a mountain, water-contaminated fluid can boil, creating vapor bubbles that make your brake pedal feel spongy and reduce braking power dramatically. This is why mechanics recommend replacing brake fluid every 2-3 years regardless of mileage.
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Explore our lubricant product range