The break wear sensor is a separate cable that mounts into the brake pad. This will show a different warning light on the dash board. There are several things that could cause the abs light to come on. There are 2 relays under the hood (red and grey) there are several fuses that can cause it. Also the ABS pump can cause the light to go on too. I would check all the fuses first, Then the relays they are about 25.00 each. If you have the bently manual that would help.