How Often Should Brake Fluid Be Changed

The recommended replacement interval for brake fluid is typically every 2 years or 40,000 miles. However, this should only be treated as a guideline. The most accurate method is to check the moisture content in the brake fluid using a dedicated tester, which is inserted directly into the brake fluid reservoir.

If the moisture content exceeds 3%, you may consider replacing it at your convenience - immediate replacement isn't necessary. However, if it surpasses 5%, we strongly recommend prompt replacement.

When brake fluid deteriorates with excessive moisture content (over 5%), this significantly affects its wet and dry boiling points. This can lead to vapourisation and vapour lock, causing noticeably spongy brake pedal feel and potentially compromised braking performance. Furthermore, it jeopardises braking system stability during continuous braking - a potentially dangerous situation requiring immediate attention.

When selecting brake fluid, beware that substandard products may damage the brake master cylinder seals and impair braking performance. For optimal results, always purchase genuine brake fluid from specialist dealers. Original equipment manufacturer (OEM) brake fluid not only performs better but also helps extend your braking system's service life.