What is the method for bleeding brake fluid?

[DelNathan]

The methods for bleeding brake fluid are: 1. Connect a bottle filled with water to the drain port using a hose, then have one person press the brake pedal inside the vehicle while another observes whether the dirty fluid has been completely drained. Add new brake fluid and continue pressing the brake pedal until clear new fluid comes out of the drain port and no bubbles appear in the water bottle. 2. Use a vacuum oil extractor to suck out the brake fluid from the drain port, then add new brake fluid and continue extracting until the discharged fluid is clear and free of air. Situations requiring brake fluid replacement include: 1. When the brake fluid absorbs moisture or contains impurities; 2. When the vehicle experiences inconsistent braking performance 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.