You could start by checking the connections on the ABS sensor's themselves. If one has come loose over time through vibration, it will cause the ABS warning light to turn on.
Does the cars ABS system still work correctly? Tell him to find an empty road, get the car up to 50km/h and anchor on the brakes. If there is any "lockup" or pulsations are not felt through the brake pedal, then something is not working.
Bookmarks