'94 Sable antilock light

I have a 1994 Sable and the antilock light stays on ... the brakes are working good ... anyone have any ideas why this light would be staying on? Thanks!

I also had this problem about a month ago. What I did was unplug the antilock relay from the connector located behind the headlight housing on the passenger side of the car, then disconnected the battery for 15-20 minuets, then reconnected everything and it has yet to come back on. Disonnecting the battery resets the computer. If this does not work, the anti-lock relay might need to be replaced or looked at by a certified mechanic, which could be quite spendy. Hope this helps a bit.