this same thing happened to me i think about two days ago, except my abs light came on, but i know that i was low on fluid to begin with when i bought the car.....the brake and anti lock brake fluids ARE seperate from each other because when your anti lock brakes stop working your braking system still works fine. As far as the dealer ripping you off, if the part in your anti lock brake system is leaking, then it should be replaced, i guess i'm just confused on how you think the dealer is trying to rip you off?