my advice is take it to an auto electrician. if you want to find the fault yourself try looking at the abs sensors at the brake assembly on each wheel. (you may have to remove the wheels) check the wiring leading to the sensors.if wiring is sound try removing the sensors and clean with contact cleaner or nail polish then refit.also try looking at all your fuses. if abs light is still on then there is a fault with your brake management system which will need expert attention. good luck.
shaffick
December 2008