What are the signs that brake fluid needs to be replaced?
2 Answers
The signs that brake fluid needs to be replaced are: 1. During emergency braking or continuous braking, the brake warning light intermittently flashes, which is due to the reduction of brake fluid. It should be inspected and replaced in time, otherwise it will affect the braking effect; 2. When the car is driving normally at a speed of more than 40KM/h and the brakes are applied sharply, the braking distance becomes longer. Excluding the factors of the brake pads, it is the problem of the brake fluid; 3. Deteriorated brake fluid will make the brake pedal feel soft even when it is pressed to the bottom, especially after continuous and frequent braking. The feeling of pressing the brake pedal will be much softer than before and elastic. After a certain period of use, the boiling point of the brake fluid will decrease, and it will be contaminated and oxidized to varying degrees. The heat resistance point of the brake fluid decreases with the change of the quality of the oil, gradually decreasing from 464°F (240°C) to 320°F (160°C). If it falls below the safety lower limit, it will endanger the brake system and cannot be ignored. Under normal driving conditions, the brake fluid will absorb about 3% of water in 2 years, reaching the critical point of failure.
As a seasoned driver with over a decade of experience, the telltale signs that brake fluid needs replacing usually include a softer brake pedal feel, less responsive braking, and delayed reaction. Sometimes, during emergencies, the braking distance may increase, or the car might even shudder slightly—all indicators that the brake fluid may have absorbed too much moisture, lowering its boiling point and compromising performance. I regularly check the brake fluid in the reservoir; if the color changes from light yellow to dark brown or if there are sediments, it's time for a change. I recommend replacing it every two years or every 20,000 kilometers, following the manufacturer's manual—never delay, as the braking system is critical for safety, and failure can have serious consequences. I use a simple moisture test pen to check the water content; if it exceeds 3%, I act immediately. When changing the fluid, I choose the appropriate DOT-rated fluid for compatibility and also inspect the brake lines for leaks. It's a small expense that prevents major issues.
