How do you check the ABS in a 1988 Ford F 250?

To check the ABS on a 1988 Ford F-250, start by turning the ignition to the "on" position without starting the engine. Look for the ABS warning light on the dashboard; it should illuminate briefly and then turn off. If the light stays on, it indicates a fault in the ABS system. Additionally, you can use an OBD-I scanner to retrieve any error codes related to the ABS for further diagnosis.