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Old 01-16-2015, 03:53 PM   #1
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ABS light

Guess I'm off to a Freightliner dealer to find out why my ABS light on the dash is now on ....

Brakes work fine so don't know what's going on... Any thoughts ???


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Old 01-16-2015, 08:02 PM   #2
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Have you tried cycling the ignition switch a few times? I assume that if you have the computer scan'ed it will have a trouble code attached to it. Hopefully it is just a sensor.
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Old 01-16-2015, 08:06 PM   #3
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I driven it a few hundred miles with the light on, turning ignition off many, many times and light stays on.... Hopefully, a computer scan will show what's going on....


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Old 01-16-2015, 08:32 PM   #4
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Might check fuses, generally in ABS and airbag systems the controller turns the fault light off. Hope you'll have an easy fix.


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Old 01-16-2015, 08:36 PM   #5
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You will still have brakes, just no anti-lock/anti-skid control.

The ABS computer spends it's time counting wheel revolutions. They should all agree 99.99% almost all the time. During braking if one wheel spins slower then brake pressure is reduced to that wheel.

If the ABS computer for some reason cannot make its calculation it suspends ABS control and turns on the light. The most common failure is also the cheapest to fix, one of the sensors that measures wheel speed is not working/damaged/disconnected.

Have you had any of the wheels off lately? That's the most likely time a sensor could have been damaged.
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Old 01-16-2015, 09:01 PM   #6
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either or the light is a warning that there is something wrong with the system,have it checked out
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Old 01-16-2015, 10:15 PM   #7
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Put new tires on rig back in April so find it hard to believe it could just now rear it's ugly head....


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Old 01-16-2015, 10:58 PM   #8
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I doubt it's your tires, you have wheel speed sensors, tone wheels for those sensors, dump valves to release the "skidding" wheel/tire, wiring in between, and the controller. As noted earlier, your braking still works, just the anti-lock is not operating. Again, hoping for a quick and easy fix. Safe traveling.


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Old 01-17-2015, 08:00 AM   #9
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Don't know if you can do this but on my GT378 I disconnect the chassis battery for about 3 minutes to reset the ABS computer and then reconnect the battery. The light will extinguish within a mile of driving. My light will sometimes illuminate if I venture onto the warning strip in the hammer lane of the interstate. Of course this procedure is predicated on there not being an actual ABS fault. Works for me.
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