How often should brake fluid be replaced in a sedan?

[LaHadley]

Sedan brake fluid should be replaced every 2 years. The composition of automotive brake fluid is castor oil and low-carbon alcohol. Brake fluid is an important oil in the car's braking system, serving the function of transmitting force. Situations requiring brake fluid replacement include: 1. When the brake fluid absorbs moisture or contains impurities; 2. When the vehicle experiences inconsistent braking force during normal driving, the brake fluid should be promptly replaced; 3. When the wheel cylinder rubber cup expands excessively; 4. Brake fluid should be replaced every two years. Characteristics of brake fluid include: 1. Good viscosity-temperature performance and low freezing point, ensuring good fluidity at low temperatures; 2. High boiling point, preventing vapor lock at high temperatures; 3. Minimal quality changes, avoiding corrosion and deterioration of metal and rubber.