Brake fluid is a kind of sticky fluid, and hence, it is understandable if this fluid leaves stains on surfaces it has come in contact with.. Furthermore, any fluid that contains oils and other automotive fluids can both degrade and even weaken the asphalt that effectively holds your driveway together
Most times, brake fluids are either brown or even very transparent when new and unused, but they eventually darken with time and use. In addition, it is also very slippery as well, although it is very important in stopping your car
So, yes, brake fluids can and commonly do stain concrete. Luckily, all you may require to take care of its concrete stain is ordinary water and a good detergent, since brake fluid is water-soluble.