A brake flush is a maintenance procedure that involves removing all the old brake fluid from the brake system and replacing it with new fluid. The procedure is also known as a brake fluid exchange or brake fluid change. Brake fluid is hygroscopic, which means it absorbs moisture over time, and this can lead to a reduction in the boiling point of the fluid, which can affect brake performance. A brake flush is typically recommended every 2 years or 30,000 miles, but this can vary depending on driving patterns and the manufacturers recommendations. Signs that a brake flush may be necessary include a soft, spongy, or bouncy brake pedal, delays or difficulties while slowing or stopping the vehicle, and low brake fluid levels. It is important to have the brake system inspected regularly and to follow the manufacturers recommended maintenance schedule to ensure proper brake functioning and safety on the road.