 and it's below the add mark, and it can make it come on and off like as the fluid sloshes around. Low brake fluid can do it. I want to also caution everybody not to overfill your brake fluid, though. There's a full mark on there. Don't go over that, because if you do, the brake fluid won't have anywhere to expand to. It can put pressure on your brakes, wear your brakes out faster, or even lock your brake system down.