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Author Topic: ABS problem  (Read 925 times)

Offline Twisty

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ABS problem
« on: January 14, 2015, 03:44:41 PM »
I just did the front brakes on a 1998 Chevrolet C2500.  Pads, rotors, calipers, and wheel seals are all brand new.  The truck stops great and the brakes perform as they should, but it seems that the ABS motor is constantly running when driving, and actively working whenever you apply the brake (it gets louder, and you feel the pulsating in the pedal).  Sometimes the ABS light comes on.  For the time being I removed the ABS fuse. 

I'm wondering if it is one of the front wheel sensors, because they were bathed in a film of rust particles (from the now nonexistent dust shields).  Thinking I would improve the condition of the vehicle, I brushed them off. 



I do not have a scanner to check for codes, but I have been eyeing this one from Innova.  http://www.amazon.com/Equus-3150-Professional-Diagnostic-Vehicles/dp/B001QIYAQ0  The ability to read OBD2, ABS, and SRS is appealing to me since the airbag light occasionally comes on in my WJ. 
« Last Edit: January 14, 2015, 03:45:07 PM by Twisty »
88 MJ buggy, 4.0/AW4, 203/205, 3 link front/4 link rear on airshocks, 42" Iroks, full hydro

"Only wealthy men can afford to buy cheap things."

Offline SPYDER

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Re: ABS problem
« Reply #1 on: January 14, 2015, 03:59:14 PM »
can't really help with the abs issue...but that code reader is decent.  most aftermarket scanners will only read certain abs codes from certain vehicles.  same with airbag lights.  I have a 300$ scanner from snap on and I can only read 3 makes for abs (Chrysler/ford/Mazda)
05 Tj d44's, 4.88s, ARB's, 37's and some bling
99 TJuggy d60,5.13s, ARB/Spool, 40's, backhalfed
06.5 GMC 2500
05 WK 2" w/32's

Offline Posimoto

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Re: ABS problem
« Reply #2 on: January 14, 2015, 05:58:04 PM »
Is your truck a late 98? The 99 trucks had a abs recall for premature rust on the wheel speed sensor. They had issues on other GM truck from 1995-01 for the same reason, rust and debris would increase the air gap between the wheel sensor and hub ring.   

I would remove the wheel sensors from the hubs and clean the surface on the hub that they mount too. Add a bit of grease to that surface, so it doesn't rust again, and reinstall the sensors. Also check your wheel bearings, loose wheel bearings can cause a misread at the sensor, I doubt you would miss a bad wheel bearing but it's worth checking the 12/6 position on your tires.   
"That's the trouble with research on the internet, there's no way of verifying its truth" --Abraham Lincoln

71 CJ5 V6/T14/D18/Warn OD (from CO)
79 CJ5 304/T-150 Silver Anniversary
79 CJ5.5 360/T-18/4.1 D-300
77 CJ5 360/T-18/3.15 D-20
77 CJ7 258 Fuel Injected T-18/D-20 (from CO)

Offline Twisty

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Re: ABS problem
« Reply #3 on: January 14, 2015, 07:57:49 PM »
I do not know if it is early or late 98.  I will check the door sticker.

I had the wheel bearings apart when I did the rotors.  I re-packed them with "GM approved" grease and set the torque on the bearings.  I should check them again to be sure that they are not loosening up, and I will try to clean the sensors off.  I'm afraid that if I remove them, I might not get them back on again. 

Thanks.


EDIT:  I just looked up a pic of the wheel speed sensor on Rockauto, and it looks like the dust shield and sensor are essentially one unit.  I'd like to try to scan the ABS computer to find out which one is giving me issues.
« Last Edit: January 14, 2015, 08:04:35 PM by Twisty »
88 MJ buggy, 4.0/AW4, 203/205, 3 link front/4 link rear on airshocks, 42" Iroks, full hydro

"Only wealthy men can afford to buy cheap things."

Offline jps4jeep

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Re: ABS problem
« Reply #4 on: January 15, 2015, 07:58:41 AM »
Is your truck a late 98? The 99 trucks had a abs recall for premature rust on the wheel speed sensor. They had issues on other GM truck from 1995-01 for the same reason, rust and debris would increase the air gap between the wheel sensor and hub ring.     

This, mine did the same thing, and his truck, regardless of the year is included since the gmt400 2500 continued until 2000. 1998 was only the 1500 pickups.
The quickest and easiest solution, which I used was to unplug the ABS sensor at the wheel bearing and then put a piece of electrical tape over the light in the dash.  You will not have ABS, but your brakes will function as normal (sans ABS)  the correct solution is new wheel bearings which will have the sensor built in.  Since yours is 2wd, yours is in the brake shield.  I do not know if yours is "servicable" (as in part of the shield)  When I sas, I ended up just removing all that crap and pulled the abs light bulb out of the dash.

Edit, just read your post, looks like you found it.
« Last Edit: January 15, 2015, 08:00:03 AM by jps4jeep »
Dad always said "If it has boobs or spark plugs it will be fun AND will cause you problems."

Offline SPYDER

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Re: ABS problem
« Reply #5 on: January 15, 2015, 12:49:24 PM »
if you don't have this squared away by the polar plunge and we both end up going ill bring my scanner and you can at least check your codes...if it read it.
05 Tj d44's, 4.88s, ARB's, 37's and some bling
99 TJuggy d60,5.13s, ARB/Spool, 40's, backhalfed
06.5 GMC 2500
05 WK 2" w/32's

Offline Krome

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Re: ABS problem
« Reply #6 on: January 15, 2015, 01:08:22 PM »
You can check the sensor for continuity if you think the issue is sensor related...I think. I don't work on cars much anymore but I remember this

Offline jps4jeep

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Re: ABS problem
« Reply #7 on: January 16, 2015, 07:23:52 AM »
if you don't have this squared away by the polar plunge and we both end up going ill bring my scanner and you can at least check your codes...if it read it.

Won't throw a code, the sensor just thinks the front tires are locked up. 
It's not neccessarily rust on the sensor, the rust builds up where the sensor is attached and causes the sensor to not be properly alligned with the tone ring, at slow speeds ( 10mph and under at least with mine) the ABS would kick on.
Dad always said "If it has boobs or spark plugs it will be fun AND will cause you problems."

Offline Posimoto

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Re: ABS problem
« Reply #8 on: January 16, 2015, 08:14:23 AM »
The light did come on so I would think there would be a stored code. Removing the abs fuse as he did may or may not add another code IMO.
"That's the trouble with research on the internet, there's no way of verifying its truth" --Abraham Lincoln

71 CJ5 V6/T14/D18/Warn OD (from CO)
79 CJ5 304/T-150 Silver Anniversary
79 CJ5.5 360/T-18/4.1 D-300
77 CJ5 360/T-18/3.15 D-20
77 CJ7 258 Fuel Injected T-18/D-20 (from CO)

Offline jps4jeep

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Re: ABS problem
« Reply #9 on: January 16, 2015, 08:16:48 AM »
I could be wrong, but mine never had one or stored one.
Dad always said "If it has boobs or spark plugs it will be fun AND will cause you problems."

Offline Posimoto

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Re: ABS problem
« Reply #10 on: January 16, 2015, 08:48:19 AM »
On many vehicles some abs system problems will set a trouble code in the computer memory but will not light the warning lamp. However, I trust your knowledge of chevys trucks.   
"That's the trouble with research on the internet, there's no way of verifying its truth" --Abraham Lincoln

71 CJ5 V6/T14/D18/Warn OD (from CO)
79 CJ5 304/T-150 Silver Anniversary
79 CJ5.5 360/T-18/4.1 D-300
77 CJ5 360/T-18/3.15 D-20
77 CJ7 258 Fuel Injected T-18/D-20 (from CO)

Offline SPYDER

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Re: ABS problem
« Reply #11 on: January 16, 2015, 09:17:06 AM »
either way ill try to remember to bring it so we can check.  I know a lot of Chryslers will kick the light on and set a code, but if the issue goes away within a certain period of time it will turn the light off but the code stays for a certain amount of warm up cycles.
05 Tj d44's, 4.88s, ARB's, 37's and some bling
99 TJuggy d60,5.13s, ARB/Spool, 40's, backhalfed
06.5 GMC 2500
05 WK 2" w/32's

Offline Posimoto

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Re: ABS problem
« Reply #12 on: January 16, 2015, 09:35:32 AM »
Just for reference, his warning lamp goes on intermittently prior to him pulling the fuse. 
"That's the trouble with research on the internet, there's no way of verifying its truth" --Abraham Lincoln

71 CJ5 V6/T14/D18/Warn OD (from CO)
79 CJ5 304/T-150 Silver Anniversary
79 CJ5.5 360/T-18/4.1 D-300
77 CJ5 360/T-18/3.15 D-20
77 CJ7 258 Fuel Injected T-18/D-20 (from CO)


 



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