When should brake fluid be changed based on its color?
2 Answers
Brake fluid should be promptly replaced when it turns very dark black or becomes cloudy in appearance. Below is relevant information about automotive brake fluid: Function: Brake fluid is the liquid medium that transmits braking pressure in hydraulic braking systems, used in vehicles equipped with hydraulic braking systems. Within the braking system, it serves as a force-transmitting medium. Since liquids cannot be compressed, the pressure output from the master cylinder is directly transmitted to the wheel cylinders through the brake fluid. Characteristics: Automotive brake fluid has an extremely low freezing point, ensuring good fluidity in low-temperature conditions. It also has an exceptionally high boiling point, preventing vapor lock in high-temperature conditions. During use, brake fluid exhibits minimal quality degradation and does not cause corrosion to metals or rubber.
When I was driving my old car, I noticed something was off with the brakes. Upon checking the brake fluid, I found it had turned dark and sticky, almost a deep brown color, which was when I realized it needed to be replaced. What I learned is that new brake fluid is usually light yellow or transparent, as clear as water. Over time, it absorbs moisture and contaminants from the air, gradually darkening in color. If it turns deep brown or black, it means it's saturated with moisture, lowering its boiling point, which can lead to longer braking distances and slower response in emergencies. I almost had an accident before I took it seriously. It's best to check the color change every two years and not wait for problems to arise. If the color darkens, replace it immediately—safety first. Regularly inspect the fluid reservoir yourself; if it appears cloudy or darkened, it's time to take action. Don’t underestimate this small detail—it can save your life.