Hey, what's that spot? There are many fluids in your vehicle, and if it seems you're leaking a mystery fluid, it can be worrying to not know what it may be. Today's featured fluid is brake fluid. This is hydraulic fluid which can range in color from clear to dark brown. You may mistake it for engine oil, but it's much more slippery to the touch. This is a very important fluid, and if it seems that your vehicle has a brake fluid leak, this is an emergency! Do not try to drive the car before this problem is inspected and fixed!