Quick and to the point, the reason to change your brake fluid is to save your ass! Brake fluid is a hydroscopic which means it attracts water, big deal right? Wrong, through the brake lines and through your resevoir brake fluid attracts water, water has a really low boiling point, the more water in your lines the lower your boiling point. So you smash the brake pedal to stop you from slaming into the car ahead of you but your brakes barely keep you from hitting him. Your pedal feel may be very “mushy” as some may say. Your pads and rotors are fine so what’s the deal. When you slammed your brakes their is a good chance your brake fluid boiled, in turn becoming a gas. Which we all know you can compress gas a lot! So your pedal sinks to the floor. Of course that is worst case scenerio but that is the situation that we are trying to avoid by changing our fluid. Another reason is with our expensive ABS ESP etc. etc. we want to prolong their life as long as we possibly can, new brake fluid will keep corrosion to an absolute minimum.
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