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Problem with ABS brakes on chevy dually

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Old 05-25-2004, 12:03 AM
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Default Problem with ABS brakes on chevy dually

I need help trying to figure out what is wrong with my ABS system. The ABS system activates only when I am braking and turning at the same time. I know the wheels are not skidding when this happens. It never does this when I am braking in a straight line. This problem started happening after I put a Detroit Locker in the rear axle. The truck is a 2wd chevy dually. Has this happenes to anyone else? What may be the problem?
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Old 05-25-2004, 12:43 AM
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Default Re: Problem with ABS brakes on chevy dually

Very likely that the locker could be causing rear wheels to turn at a rate different than what the system is set up to "see". In other words without the locker the wheels would turn at a different rate and with the locker they are turning at an equal rate. Not sure how to fix that exactly, but a good 4wd shop should know about this problem as it would be common with these modifications.
 
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Old 05-25-2004, 06:22 AM
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Lightbulb Re: Problem with ABS brakes on chevy dually

1st what year dually is She..second if she is 1996 or newer she should have a OBD2 computer system and 4 wheelantilock brakes.What you will need to diag this is either a GM tech2 scan tool or I think snapon will work..Go into the software to watch the
wheel speed sensor readings should be a screen with four readings. next monitor all 4 speeds 1 for each wheel sounds like 1 is dropping out before the rest causing your ABS to think a wheel is locking and then activating..she may have a chaffed wire or a partial break in one and it is aggrivated when you turn the wheels..causing a signal interupt..Good Luck
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Old 05-25-2004, 07:32 AM
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Default Re: Problem with ABS brakes on chevy dually

I had the same issue with my Ford. It turned out that the rear springs and shocks were smoked and when I was in a turn the tires would hop causing the computer to freek. Since I replaced the shocks and springs I have had no issues.

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Old 05-25-2004, 08:46 AM
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Default Re: Problem with ABS brakes on chevy dually

Blown is probably right, you need to get reprogrammed.

The Locker axles may cause a reading the computer does not recognize.

Also, depends upon the year. Earlier GM's only had ABS on the rear wheels.

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Old 05-25-2004, 11:12 PM
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Default Re: Problem with ABS brakes on chevy dually

I've got a Detroit in my Hummer w/ ABS and no problems. Can't even tell the Detroit is back there except off road.
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Old 05-26-2004, 02:09 AM
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Default Re: Problem with ABS brakes on chevy dually

the truck is a 1996 with 4 wheel ABS
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Old 05-26-2004, 06:36 AM
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Default Re: Problem with ABS brakes on chevy dually

Quote:
Originally Posted by phughes69
the truck is a 1996 with 4 wheel ABS
Look For a broken wheel speed sensor ar chaffed wire.. the wire comes off the hub and has two wires in the shield and has a connector about 12 inches from the sensor . the sensor can be found on the inside of the front hubs (kind of behind the calipers) inspect the connectors and wire/shielding for damage.. that is the visual test otherwise refer to my above info..
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