ABS light on and off.

Operators, the ABS light on the 5-tonner's dashboard does two things: It lets you know the anti-lock braking system is working, and when it's not.

Simply put, the light comes on for about three seconds at startup. Then, it goes off when the system is working properly. If the light doesn't come on, the bulb probably needs to be replaced. Until the bulb is replaced, assume the ABS is not working. When the light stays on, you know something's wrong with the ABS. Either way, you must change your driving style.

Stay safe behind the wheel and take TM 9-2320-272-10 to heart. Keep these pointers in mind when the roads are wet and the ABS is malfunctioning--when the ABS light stays on or there's no light at all at startup.

* Slow down to a maximum speed of 40 mph.

* Remember to apply the brakes gradually when stopping. Sudden stops lock the wheels, and can stall the engine and cause the truck to lose power steering.

Have your mechanic install a warning sticker, NSN 7690-01-530-5506, just under the ABS light.

It carries the following warning...

ABS WARNING!

Steady illuminated lamp indicates a malfunctioning anti-lock brake system.

If malfunctioning, use gradual braking techniques listed in TM 9-2320-272-10 (Operation w/o ABS).

40 mph maximum speed with steady lamp.