Which action is appropriate when brake fluid is contaminated?

• A. Flush and bleed the system with correct DOT specification fluid
• B. Add more fluid
• C. Replace pads
• D. Ignore

Answer: (A)

When brake fluid is contaminated, the proper action is to flush and bleed the system with fresh fluid that meets the correct DOT specification. Contaminants such as water, dirt, or degraded seals lower the fluid’s boiling point and can cause corrosion inside the hydraulic circuit, swelling seals, and a spongy or grabbed brake feel. A full flush removes the dirty fluid and any moisture, and bleeding ensures air is purged from the lines so the system returns to a firm pedal and reliable braking performance. Use the same DOT specification the system is designed for, because mixing fluids can create chemical incompatibilities, damage seals, and lead to unpredictable braking behavior. After flushing and bleeding, verify the pedal feel, check for leaks, and ensure the reservoir is properly topped up. Simply adding fluid won’t remove contaminants, replacing pads doesn’t fix the hydraulic fluid condition, and ignoring the issue can lead to brake failure or accelerated corrosion.