Clean brake fluid plays a vital role in lubricating brake components and allowing your vehicle to stop efficiently, especially under heavy loads or high temperatures. The average motorist drives 10 to 15,000 miles per year and uses the brakes about 75 thousand times. We recommend changing the brake fluid every two 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, the moisture could corrode internal parts, leading to costly repairs and replacements. Water vaporizes at high temperatures, turning to air in the brake lines. From a safety standpoint, air in the braking system will dramatically increase the distance required to stop, possibly 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.