* The vehicle's documentation: The owner's manual or the original window sticker will list the equipment included.
* The ABS light: If the vehicle has ABS, there will be an ABS warning light on the dashboard. However, the light being *on* indicates a problem with the ABS system, not necessarily its absence.
* The vehicle itself: Look for ABS sensors on the wheels and brake calipers. However, this requires some mechanical knowledge to identify.
Therefore, you can't assume it has ABS just because it's a 4WD. You need to check the vehicle's documentation or the vehicle itself.