How Often Should Brake Fluid Be Replaced in Kilometers?
3 Answers
Generally, brake fluid should be replaced approximately every 40,000 kilometers or every 2 years, depending on the vehicle's usage. Brake fluid, also known as hydraulic brake fluid, plays a crucial role in the braking system. When you press the brake pedal, the force is transmitted by the master cylinder's piston through the brake fluid to the wheel cylinders, which then expand the brake pads to make contact with the brake discs, achieving the braking effect. If the water content in the brake fluid exceeds 3%, it indicates significant deterioration, and replacement should be considered immediately. This is because the water content affects the boiling point of the brake fluid—higher water content lowers the boiling point, making the fluid prone to boiling during continuous braking, which can lead to brake failure.
As a car owner, I’d like to share that I change my brake fluid every 40,000 kilometers. At first, I didn’t understand why it was necessary, but the technician explained that brake fluid tends to absorb moisture, which over time can affect braking performance: the brake pedal feels spongy and responds sluggishly. This is especially noticeable in mountainous areas or during rainy weather. Absorbed moisture can also corrode system components. Regular replacement helps prevent major repairs, such as pump damage, which can cost thousands to fix. My routine is to check the moisture content during every 40,000-km service. Requirements vary by dealership, but 40k is a common interval—safety first, don’t delay.
Years of experience in car repair have taught me that the brake fluid replacement interval is crucial: generally, it should be changed every two years or 50,000 kilometers. I've seen too many cases where failure to change the fluid leads to water absorption, lowering the boiling point and causing frequent brake failure accidents, especially for those who drive long distances. Checking for moisture is simple—just use a test pen, and it takes only a minute. Regular maintenance can prevent trouble, such as expensive brake system repairs and wasted time. Following the manual's guidance is key; for most cars, changing it at 50,000 kilometers is very safe. Don't wait for problems to arise before taking action—make it a habit.
