Is it necessary to change the brake fluid for a car?

[VanMolly]

The brake fluid in a car needs to be changed. The replacement steps are as follows: 1. First, park the car on level ground, turn off the engine, and engage the handbrake. 2. Use a jack to support the right rear of the car, remove the right rear wheel, locate the bleeder valve on the wheel cylinder, and attach a prepared 40 cm long rubber tube to the bleeder valve to prevent waste fluid from contaminating the ground or the car body. Place the other end of the tube into a wide-mouth bottle. 3. Use a small open-end wrench to hold the hexagon at the base of the bleeder valve. Have another person press the brake pedal inside the car, then turn the wrench counterclockwise. The waste fluid will start flowing into the wide-mouth bottle. When the flow noticeably weakens, turn the wrench clockwise and call out "release," at which point the person in the driver's seat should release the brake pedal. 4. Loosen the bleeder valve again and call out "press," and the person in the driver's seat should press the brake pedal again. Repeat this process four times, then have the driver exit the car and add new brake fluid to the brake fluid reservoir. After filling it, return to the driver's seat and continue the previous steps until the discharged waste fluid becomes clear, indicating that the new fluid has pushed out the old. Finally, turn the wrench clockwise and call out "release," and the driver should release the brake pedal. 5. Remove the rubber tube, clean the bleeder valve with a soft cloth, and have the driver press the brake pedal a few more times to check for any fluid leakage, ensuring the bleeder valve is tightly closed. Reinstall the right rear wheel, completing the bleeding process for one wheel cylinder.