How often should car brake fluid be replaced?

[AndresDella]

It is recommended to replace car brake fluid every two years. The brake disc plays a driving role in the car's braking system. When you press the brake pedal with your foot, with the assistance of the vacuum booster, it pushes the master brake cylinder, which in turn pushes the brake fluid. The force from your foot is transmitted through the brake fluid to the brake wheel cylinders at each of the four wheels, causing the brake pads to squeeze the brake disc and generate braking force. During prolonged or emergency braking, the braking system can cause the temperature of the brake fluid to rise rapidly. Moreover, brake fluid itself has strong hygroscopic properties, absorbing moisture from the surrounding air, such as during car washes or in humid conditions. Over time, the accumulated moisture in the brake fluid directly lowers its boiling point, thereby reducing the braking force of the brake fluid. If the car's brake pedal feels unusually soft when pressed, it may be time to consider replacing the brake fluid.