What are the conditions for brake fluid replacement?

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The conditions for brake fluid replacement are: 1. The brake fluid absorbs moisture or contains impurities; 2. When the vehicle exhibits inconsistent braking performance during normal driving, the brake fluid should be promptly replaced; 3. The wheel cylinder rubber cup expands excessively; 4. The brake fluid should be replaced every two years. The method for replacing brake fluid is: 1. Park the vehicle on level ground, turn off the engine, open the hood, and drain the fluid from the reservoir; 2. Use a funnel to fill the reservoir with new brake fluid; 3. Use a jack to lift the vehicle and start removing the tires from the rear wheels; 4. Remove the rubber dust caps on the brake calipers; 5. Use a wrench to loosen the bleed screws and attach a rubber hose to them, connecting it to a drain bottle; 6. Have someone press the brake pedal inside the vehicle while observing the fluid drainage until the fluid level in the engine compartment reservoir reaches the lower limit.