Why should we change brake fluid for cars?

Why should we change brake fluid for cars?

Brake fluid replacement is required every two years or 40,000 kilometers according to the car maintenance regulations.The liquid brake system transmits pressure for a long time to stop the wheel from rotating, the internal oil will deteriorate, and the brake oil has water absorption characteristics.If failure to replace the brake fluid in time then will cause the brake system to work abnormally, causing an accident .