How many kilometers to change brake fluid?
3 Answers
Change the brake fluid at 40,000 kilometers. The following is a related introduction to brake fluid: 1. Function of brake fluid: Automobile brake fluid has a very low freezing point, ensuring good fluidity in low-temperature conditions; it also has an extremely high boiling point, preventing vapor lock in high-temperature conditions. When using automobile brake fluid, you will notice minimal quality changes, and it does not cause corrosion to metals or rubber. 2. Concept of brake fluid: Automobile brake fluid is the liquid used in hydraulic brake systems. It must be chemically inert, unaffected by high temperatures, and should not cause corrosion, softening, or expansion to metals and rubber. Currently, the commonly used types are DOT3, DOT4, and DOT5.
Having driven for ten years, I've learned that brake fluid replacement shouldn't solely rely on mileage. My car's maintenance manual recommends changing it every two years or 40,000 kilometers, but last time during testing, we found the moisture content exceeded standards after just one and a half years during the southern rainy season. The mechanic used a testing pen inserted into the fluid reservoir – when the light turns yellow, it's time for a change. The most obvious signs are when the brake pedal feels soft like stepping on a sponge during emergency stops, or when the braking distance noticeably increases. These signals are more accurate than the odometer. Squeaky brakes from overheating on mountain roads are also a warning. Remember to choose DOT4 standard fluid, as mixing different types can damage rubber seals.
Veteran drivers know that brake fluid is like an invisible safety officer. The general benchmark is four years or 50,000 kilometers, but for those who frequently drive long distances, it's recommended to change it at 30,000 kilometers. Once, my friend's car had shaky brakes, and it turned out the fluid was full of bubbles like Sprite, even corroding the metal brake lines. Those with upgraded brake calipers should change it more frequently—performance brake pads operate at higher temperatures, causing the fluid to degrade much faster. If you notice the fluid level dropping quickly or the color changing from light yellow to soy sauce, it's time to be alert.
