In any case, if you apply the brakes on a very short runway it will be done within seconds of touch down for obvious reasons. If the pedals go flat on first pressure you simply go-around and then reconsider your options. If you have landed on a long runway you probably won't need the brakes until you have almost stopped by drag alone so if the brakes go flat on first touch then there is no sweat. So - no point in "testing' the brakes before landing is there?