abs light on dashboard

I bought my 2000 caravan used and w/o owners manual, so maybe someone can answer this for me. the ABS light has come on on the top right side of the dashboard - doesn't happen all the time, just some of the time. What should I be concerned about?

Get it in and have the fualt codes read and diagnosed. First check all the fuses both under the hood and under the dash, check the fluid level.