Clean brake fluid plays a vital role in internally lubricating brake components and allowing your vehicle to stop efficiently, especially under heavy loads or high temperatures. The average motorist drives 10-15,000 miles a year and uses their 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 fluids 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 of fluid leak.