2003 Ford Explorer

ABS light is the anti lock brake system that help you give the ability to recover ther steering should the truck go into a skid. IT grabs and releases the brakes in a pulsating fashion. There are sensors that record the wheel speed and when any are not giving the same speed to the computer it can throw the light and sometimes give a false abs braking action.

When the light is on there is no longer a functioning abs system present although your mechanical brkes will still work.

Get the codes read in the computer and post them. OR take it to a professional shop that uses a hand held computer that interfaces with the trucks for them to diagnose it properly.