When Should Brake Fluid Be Replaced?
2 Answers
Brake fluid should be replaced every 40,000 kilometers or approximately every 3 years. If the vehicle is frequently used in rainy areas, the replacement interval should be shortened accordingly. Car owners can periodically open the engine hood to check if the brake fluid level is low. If brake fluid is replenished but the level drops again shortly after, it is essential to immediately inspect for any leaks. Note that brake fluid is corrosive to car paint and skin, so any spills should be cleaned promptly. Brake fluid is hygroscopic, meaning it absorbs moisture from the air, so always ensure the cap is tightly secured after adding brake fluid to prevent moisture absorption.
When it comes to changing brake fluid, I’ve driven an old car for over a decade and have deep personal experience. A while back, while braking hard on the highway, I felt the pedal go soft—almost had a close call. Upon inspection, I found the brake fluid had absorbed too much moisture, dropping its boiling point into the danger zone. Brake fluid acts like a sponge, absorbing water from the air over time, causing the boiling point to plummet. Under high temperatures, it can boil and form bubbles, cutting braking power in half. I recommend changing it every two years or 20,000 kilometers, especially in humid southern cities where it’s even more critical. Most manuals also specify this. Neglecting it can have serious consequences—like losing braking power on long descents or in rainy weather, risking accidents. I always have the repair shop test the moisture content with specialized tools; if it exceeds 3%, I replace it immediately. Now, regular checks are a habit—safety first. Spending a few hundred bucks saves big trouble down the road. And don’t forget to bleed the system thoroughly to avoid air bubbles affecting performance.
