ABS help

93-bucket

93-bucket

Club Member
On my 2000 blazer the ABS system intermittently activates when you slow down & turn to the left while pressing on the brake pedal , such as pulling into my driveway to park , it does not activate when you turn to the right & do the same thing..
I looked at the harnesses and everything looked ok, maybe a wheel Bearing is taking a crap?
any help is appreciated thanks...
 
I'm guessing it's the wheel bearing/Sensor then....I'm not 100% sure so you might wanna wait for someone else to answer....I just work on U-Haul truck LoL
 
93-bucket said:
On my 2000 blazer the ABS system intermittently activates when you slow down & turn to the left while pressing on the brake pedal , such as pulling into my driveway to park , it does not activate when you turn to the right & do the same thing..
I looked at the harnesses and everything looked ok, maybe a wheel Bearing is taking a crap?
any help is appreciated thanks...
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You'd need a scanner to figure out which hub it is but one of the hubs has rust in it and is over reading speed most likely. Best bet in all honesty is to go ahead and break down and do both hubs. You'll just end up replacing one right after the one thats broken for the same issue shortly after you fix the truck.
 
Sean said:
You'd need a scanner to figure out which hub it is but one of the hubs has rust in it and is over reading speed most likely. Best bet in all honesty is to go ahead and break down and do both hubs. You'll just end up replacing one right after the one thats broken for the same issue shortly after you fix the truck.
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I replaced the right a few years ago, I did buy both but only did the one..
I see what you are saying though, sad that this stuff last a whopping 80k miles..
its ridiculous how many wheel bearing I have replaced for family too...
thanks Sean...

BTW does the ABS light have to trip to give a code or tell what bearing is faulty?
The light did come on for a few seconds when this happened..
 
1BADAIR said:
pull the sensors and clean the surface
very very common on alot of Gm's
edit. here is the TSB
http://content.chiltonsonline.com/TSB/displayTSBHandler.ashx?assetID=40795&key=6kAUBD5BruOJf%2f3tgozUqjXM3RdbjcQqW4sVWiE%2fp2IojfpfKqM07dr61%2bQAWHtTepAvXKJOCiGaydj17g309uGTa0fm1YpjLRCAvSGY4JQ9vV035FiFDQ%3d%3d
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I've done that. It last a few days/weeks sometimes and then back to the same problem. The seal on the bearing is bad and water is cuasing corrosion to slag up on the tip of the speed sensor inside the hub. Cleaning it is just a bandaid.
 
93-bucket said:
I replaced the right a few years ago, I did buy both but only did the one..
I see what you are saying though, sad that this stuff last a whopping 80k miles..
its ridiculous how many wheel bearing I have replaced for family too...
thanks Sean...

BTW does the ABS light have to trip to give a code or tell what bearing is faulty?
The light did come on for a few seconds when this happened..
Click to expand...


No not unless it read way off all the time. Which is pretty rare. I would not be shocked if in a week or 3 that the bearing started to make noise. They usually do this right before they fail.

ABS light comes on anytime the system is actively preventing skidding.
 
Sean said:
No not unless it read way off all the time. Which is pretty rare. I would not be shocked if in a week or 3 that the bearing started to make noise. They usually do this right before they fail.

ABS light comes on anytime the system is actively preventing skidding.
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It just had to do it when it got cold again..lol thanks man...
 
What happens for the ABS to engauge is the system sees at least one wheel speed reach a value of 0 while the other wheels are reading a speed of 6mph or above. How a wheel speed sensor works is the tone wheel passing by the sensor creates AC voltage which is then translated by the ABS computer to speed (mph or kph). The relation of the sensor to tone wheel (air gap between the two) is critical for uniform reading. Here in Michigan we have RUST. It affects every thing on the modern vehicle. The wheel bearing is made of steel, the sensor is plastic. The mating surface in which the sensor mounts builds up with rust, which in turn pushes the sensor up widening the air gap. This is where the problem lies, the larger the air gap is the more the low speed reading is effected. If one was to remove the speed sensor from the bearing and clean the mating surfaces of all rust the sensor will read correctly. This is a common problem with GM trucks and also some Ford vehicles.
I have never run across the end of a speed sensor corroded and slagged up. Usually if the bearing seal is bad, the bearing usually fails from internal corrosion.
 
93-bucket said:
I guess my biggest concern is if it will do this on the freeway?
Would disabling the abs system be a option?
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Pulling the fuse for the ABS pump motor and it will deactivate the ABS system. However defeating safety equipment is never recomended or endorsed by anyone from CARS INC.
 
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