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94 International 4900 ABS light won't turn off

Not You

Well-Known Member
Joined
Feb 21, 2014
Messages
66
Location
USA
Single axle truck, DT 466 engine. Found out that there wasn't a bulb in the socket, now I know why. The light won't turn off. I didn't find a fuse in the cab labeled ABS. Anything simple to check before I have to take it in for service?
 

renovator

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Joined
Oct 27, 2011
Messages
69
Location
New Mexico
I may be mistaken, but I believe the indicates the ABS system being active (i.e., the lack of the light indicating a problem). We have two Freightliners and an International and the ABS lights are always on.
 

RZucker

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Jul 7, 2013
Messages
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Wherever I end up
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Mechanic/welder
Umm... No. ABS light signifies you HAVE an issue. More than likely a wheel sensor is bad. Find the info for your particular system, and it should tell you how to troubleshoot them with a good multimeter.
 

Truck Shop

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Dec 7, 2015
Messages
16,537
Location
WWW.
Umm... No. ABS light signifies you HAVE an issue. More than likely a wheel sensor is bad. Find the info for your particular system, and it should tell you how to troubleshoot them with a good multimeter.

Zucker is right you have an issue with abs. Check the connections on the cables going to the wheels also. More than likely a sensor got pushed back
from the tone ring on a wheel. Sometimes grit can get caught in the tone ring and knock the sensor back, mainly in winter. The front axle is easy to check
you can tap the sensors in real easy. The rear wheels and drums will have to come off to check those sensors.

Truck Shop
 

renovator

Well-Known Member
Joined
Oct 27, 2011
Messages
69
Location
New Mexico
Umm... No. ABS light signifies you HAVE an issue. More than likely a wheel sensor is bad. Find the info for your particular system, and it should tell you how to troubleshoot them with a good multimeter.

Three trucks all with ABS lights on. DOT inspections, an inspection by the DOT and even an engine replaced by the dealer no one has said the lights should be off--even the state DOT.
 

Birken Vogt

Charter Member
Joined
Nov 30, 2003
Messages
5,305
Location
Grass Valley, Ca
ABS light definitely means the system thinks there is some kind of problem. Generally the codes are pretty easy to get and simple to troubleshoot if you know electronics. However there are about 10 different models of ABS out there so getting the codes can be quite different. The reason the lights are on in all those trucks is that ABS is so darn troublesome it seldom seems to function correctly for long and nobody cares enough about it to do anything because the brakes still work the same way they did for 50 years when the light is on.
 

old-iron-habit

Senior Member
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Nov 22, 2012
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4,233
Location
Moose Lake, MN
Occupation
Retired Cons't. Supt./Hospitals
Up here where road salt gets used a lot I would bet that 1/2 the ABS lights are on in any vehicle over 5 years old. As stated everyone ignores them and drives as they always did. Another forced law helping to dumb down the population by keeping them from learning how to drive on ice and snow. Dealers charge about $400 a side to replace and fix here. Probably has a lot to do with bulbs being removed.
 

RZucker

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Jul 7, 2013
Messages
4,077
Location
Wherever I end up
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Mechanic/welder
Three trucks all with ABS lights on. DOT inspections, an inspection by the DOT and even an engine replaced by the dealer no one has said the lights should be off--even the state DOT.

Reread my post... I only stated that an ABS light signifies a fault. How you deal with it is your problem. Me, I fix mine. Seems like Check engine lamps and ABS lamps that are on all the time put drivers into a complacency mode that I refuse to allow. YMMV.
 

Ruger_556

Well-Known Member
Joined
Oct 17, 2015
Messages
66
Location
Pacific Northwest
Push all the wheel sensors against the tone rings.

Three trucks all with ABS lights on. DOT inspections, an inspection by the DOT and even an engine replaced by the dealer no one has said the lights should be off--even the state DOT.

Light should turn on briefly at startup and immediately turn off. If it stays on there is an ABS fault and ABS braking is disabled. I am ASE Master Heavy Truck and International Diamond Certified.
 

mekanik

Senior Member
Joined
Aug 20, 2015
Messages
943
Location
Canada's Northwest
Are the brakes air or hydraulic? If air the module should be mounted on top of the rear relay valve.
it has a row of LEDs on it that tell you what the fault is. If it Hydraulic there is a way to get blink codes from the module
or it can be scanned. As a previous poster mentioned make sure the wheel sensors are pushed in.
The fault code on the air system has to be cleared to put the light out. Drag a magnet across the side of the module
that has the LEDs to clear it.

Terry
 
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