The average motorist drives 10 to 15,000 miles a year and uses their brakes about 75,000 times?
We recommend changing the brake fluid every 2 years or 24,000 miles
Over time brake fluid absorbs moisture through microscopic pores in the hoses and seals. Brake fluid saturated with water renders your brakes ineffective. This could cause an accident.
Left untreated this moisture could corrode many internal parts leading to costly repairs and replacement.
At high temperatures, water vaporizes, turning to air in the brake lines. From a safety standpoint, air in the braking system will dramatically increase the distance required for you to stop, possibly causing an accident endangering your life and those of others.
From an environmental point of view there is very little impact unless internal corrosion causes a fluid leak.