Air in the brake system can make your brake pedal feel spongy and vague. You should flush the fluid every two or three years, ...

the role of the brake fluid, and also the significance of flushing brake fluid from time to time. The brakes on the car function with the use of a hydraulic system that requires a special fluid.

Safety note: If you spill brake fluid on your skin, paint, wires or any car parts, flush with plenty of water. Seek immediate ...