Brake fluid is a vital lubricant in your car for ensuring efficient braking. As you apply pressure to the brake pedal when driving your car, brake fluid transfers this energy to the wheel hub to slow down your vehicle by squeezing your brake rotors. It is crucial that this fluid remains just that, fluid, and doesn't overheat to become vapour, as it will no longer work. Brake fluid can also deteriorate as it absorbs moisture from the parts of your car that it also serves to lubricate. But this increase in water content will also lower its boiling point, which is why maintaining your brake fluid is so important if you want to avoid costly brake system repairs and dangerous brake failure.