squeaking noise

You can rule out power steering fluid level by checking the fluid level, but I don't think that's your problem. Check your brake pads, see if they are low, these pads may have a pad wear sensor that is warning you that the pads need replacement (if applicable). The sensor is a thin metal strip that contacts the rotor when the pads are worn out, causing a scraping noise, however it doesn't cause any damage. There are other possibilities, so it's best to get it inspected if you are unsure about what the problem is.