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Abs Problem


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#1 PoorboyVortec5.3

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Posted 21 November 2008 - 08:35 PM

Have been expirencing ABS kicking in at about 5mph when I stop or when turning into a parking space on dry pavement or over bumps. Cleaned the speed sensors in the front they had junk on them, but looked in good condition (housing is still intact). However, I still have the ABS activating. Also the ABS light is not on.

Is there a ABS speed sensor in the rear I can try cleaning? Or is it time to throw down some cash for some speed sensors?

Truck is a 2002 GMC sierra Ext. Cab 4 wheel drive.

#2 Woodcutter

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Posted 22 November 2008 - 06:44 AM

Take it to a dealer. There is a recall on this issue.
'07 Silverado Ext. Cab 1/2-ton 4x4 | 5.3 V8 w/ AFM | 3.73 | G80 | Z85 Suspension | HD Towing Pkg | Journey HD Trailer Brake Controller | Silverbirch Metallic | Trailmaster Add-a-leaf | Husky Mud Gaurds

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#3 PoorboyVortec5.3

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Posted 22 November 2008 - 07:23 AM

Take it to a dealer. There is a recall on this issue.



Thanks will do.

#4 catrains

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Posted 22 November 2008 - 10:05 AM

Have been expirencing ABS kicking in at about 5mph when I stop or when turning into a parking space on dry pavement or over bumps. Cleaned the speed sensors in the front they had junk on them, but looked in good condition (housing is still intact). However, I still have the ABS activating. Also the ABS light is not on.

Is there a ABS speed sensor in the rear I can try cleaning? Or is it time to throw down some cash for some speed sensors?

Truck is a 2002 GMC sierra Ext. Cab 4 wheel drive.


I have done this repair many times...the sensor face/pickup is not the problem as you should only have grease not metal on the pick up...if metal the bearing is n/g....

what i have found is a rust film of .001 in thickness causing the sensor to be pushed out of the mounting hole...by removing this rust and on assembly measure for 500MV AC....IF its less than 400 you still have a problem of the sensor or its still has too much debris on the mounting surface...

#5 PoorboyVortec5.3

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Posted 23 November 2008 - 11:28 AM

Have been expirencing ABS kicking in at about 5mph when I stop or when turning into a parking space on dry pavement or over bumps. Cleaned the speed sensors in the front they had junk on them, but looked in good condition (housing is still intact). However, I still have the ABS activating. Also the ABS light is not on.

Is there a ABS speed sensor in the rear I can try cleaning? Or is it time to throw down some cash for some speed sensors?

Truck is a 2002 GMC sierra Ext. Cab 4 wheel drive.


I have done this repair many times...the sensor face/pickup is not the problem as you should only have grease not metal on the pick up...if metal the bearing is n/g....

what i have found is a rust film of .001 in thickness causing the sensor to be pushed out of the mounting hole...by removing this rust and on assembly measure for 500MV AC....IF its less than 400 you still have a problem of the sensor or its still has too much debris on the mounting surface...


Thanks... I never thought to clean the mounting surface throughly.

#6 PoorboyVortec5.3

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Posted 24 November 2008 - 11:11 AM

Have been expirencing ABS kicking in at about 5mph when I stop or when turning into a parking space on dry pavement or over bumps. Cleaned the speed sensors in the front they had junk on them, but looked in good condition (housing is still intact). However, I still have the ABS activating. Also the ABS light is not on.

Is there a ABS speed sensor in the rear I can try cleaning? Or is it time to throw down some cash for some speed sensors?

Truck is a 2002 GMC sierra Ext. Cab 4 wheel drive.


I have done this repair many times...the sensor face/pickup is not the problem as you should only have grease not metal on the pick up...if metal the bearing is n/g....

what i have found is a rust film of .001 in thickness causing the sensor to be pushed out of the mounting hole...by removing this rust and on assembly measure for 500MV AC....IF its less than 400 you still have a problem of the sensor or its still has too much debris on the mounting surface...


I want to say thanks for advice. I took out the sensors and cleaned the mounting surface. Have put about 75 miles on so far and no ABS malfauntions!!!.

#7 pontiac69

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Posted 24 November 2008 - 01:10 PM

hello i am having the same problem on my 05 silverado crew cab 4x4. my truck was at the dealer for another problem and i asked them to look at this. they "said they cleaned the abs sensors in the front and they problem didnt go away. they want me to bring it in again and pay another 100 bucks for them to diagnose the problem with the abs. i have now disconected one of the sensors from under the hood which turns off the abs, and turns on the abs dash light. for now i have been living with the abs light, i feel its safer on dry surfaces since the abs dosent activate everytime i step on the brake. how hard is it for me to try and clean these sensors. how much are these sensors from the dealer maybe if they are not to much i will just try to replace one. any help with be appriciated.

#8 PoorboyVortec5.3

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Posted 24 November 2008 - 04:38 PM

hello i am having the same problem on my 05 silverado crew cab 4x4. my truck was at the dealer for another problem and i asked them to look at this. they "said they cleaned the abs sensors in the front and they problem didnt go away. they want me to bring it in again and pay another 100 bucks for them to diagnose the problem with the abs. i have now disconected one of the sensors from under the hood which turns off the abs, and turns on the abs dash light. for now i have been living with the abs light, i feel its safer on dry surfaces since the abs dosent activate everytime i step on the brake. how hard is it for me to try and clean these sensors. how much are these sensors from the dealer maybe if they are not to much i will just try to replace one. any help with be appriciated.


It isn't very difficult. You need to take the brake caliper and rotor off first. Then you have access to the sensor. There is a single allen bolt that holds the sensor on. Take that out and very carefully work the sensor through the hole in the dust cover...it took me a little bit to get it to go through without forcing it. Then I cleaned the surface where the sensor mounts with sandpaper. (I plugged the hole first with a piece of a rag to keep stuff from falling in.)

I don't know if it matters or not but my ABS light never came on. I just had the ABS kicking in at slow speeds on dry pavement.

If it doesn't work,check Ebay for the sensors,there was a set on there last week.

Hope this helps.




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