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Thread: ABS Issues?

  1. #1
    Jr. Mechanic Swatchvy's Avatar
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    Feb 2009
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    Default ABS Issues?

    I'm just wondering if anyone else has run into any issues with their GM abs systems. My 2 brothers and I all own GM products and we all have taken out the abs fuse in our trucks. The problem was that the abs always kicked on, even in the middle of summer on dry pavement and in the winter it was a nightmare my truck was like the energizer bunny it just kept going and going. The vehicles with issue were a 97 Silverado 1500, 03 Silverado 1500, 03 Silverado 3500, 03 Sierra 3500, 00 S10, and an 03 Suburban. Normally I would think the problem is just mine, but since we all had problems, I didnt know if we were the only ones.
    Andy
    05 Silverado 1500 Z71 Until 6/5/12

    Straight Pipe Dual Exhaust
    LED Third Brake Light
    Ram Air Cowl Induction Hood
    Edelbrock Shorty Headers
    DeBadged

  2. #2

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    I have a 96 Z71 and i have the same issue. I have been trying to figure out the cause but have had no success. The only thing i can even come close to is that i did have a brake line go out on me, maybe there is air in the abs that i cant get out without a scantool for abs.

  3. #3

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    If the ABS just kicks on for no reason then you may want to check for mud, debris, or bent wheel speed sensors. The reason the ABS kicks on and rattles your foot is because the computer "thinks" one or more of your wheels is turning at a different speed than the other wheels.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
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    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  4. #4

    Default

    I have ABS Issues with my 99 Silverado also. I have Ramdomly replaced the ABS computer & all the sensors. That wasnt cheap because the sensors are "built into" the front Hub Ass. & I had to buy both @ 300 each!!! Still same problem. Mechanic says it needs a new computer AGAIN!!
    1999 Silverado 1500 X/C 5.3 240K & Running Hard

  5. #5

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    Quote Originally Posted by TxGm800 View Post
    I have ABS Issues with my 99 Silverado also. I have Ramdomly replaced the ABS computer & all the sensors. That wasnt cheap because the sensors are "built into" the front Hub Ass. & I had to buy both @ 300 each!!! Still same problem. Mechanic says it needs a new computer AGAIN!!
    wow forget that! I'm glad I just disconnected my module. Saved my self $600 dollars.
    Dan
    1999 GMC Sierra 2500 350 vortec
    1967 Jeep M725 ambulance 230 tornado
    1990 Cherokee Limited- 3 inch lift on 33's
    ...and every one of em has issues

    If you have any questions or problems don't hesitate to send me or any other GMTC moderators a PM

  6. #6
    Jr. Mechanic Swatchvy's Avatar
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    Default

    Amen to that
    Andy
    05 Silverado 1500 Z71 Until 6/5/12

    Straight Pipe Dual Exhaust
    LED Third Brake Light
    Ram Air Cowl Induction Hood
    Edelbrock Shorty Headers
    DeBadged

  7. #7

    Default

    Mine had the same problem... luckily under a 30 day / 1000 mile warrenty. Wheel sensors didn't fix the problem so it went bad just a day later and the ABS module (computer) was replaced at about $800. After it was replaced, the added boost from the new module blew every brake line in the truck. Needless to say I bet the dealership lost money on the truck after doing all that work.

    My work has 4 Chevy vans... 3 1ton SRW and 1 1ton DRW... 04's and 06's. they all have had ABS issues, multple times each in fact. Seems as though Chevy trucks are plagued by a poorly designed braking system.

  8. #8
    Sr. Apprentice
    Join Date
    Aug 2006
    Location
    NW Indianapolis Indiana
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    Default

    If I pull my ABS fuse, will it turn the ABS light on.? With the fuse pulled does it have any effect on the braking abilities.? This is on my 99 GMC K3500 Dually. I pull a trailer and don't need any more surprises...

  9. #9

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    Pulling the ABS fuse, indeed removing the ABS computer will have no affect on the regular brakes. ABS is a fail-safe system in that regard.

    If the ABS computer is bad, then you might get it repaired for $130 here:

    http://www.modulemaster.com/en/Chevy...truck_info.php

    Note: they can only repair certain models of the Kelsey-Hayes ABS computers - check the web-site for exact details.

    The only ABS problems I've experienced in my GM fleet is on my wife's '00 Pontiac Grand Prix. We had one front hub-sensor go bad at 70k miles. Later, (100k miles) we had a lower control-arm rubber bushing wear out. The funny motion of the control-arm didn't affect the handling much but did give us an ABS code. Now (130k miles), the ABS computer is on the fritz (too many alarms?), and is now at ModuleMaster as I type this.

    In talking with GM mechanics, they said the most common ABS problems are loose/dirty connectors at the wheels. The frequently fix ABS codes by simple checking all the wiring, making sure the connectors are clean and secured in place.

    As for bleeding the brakes on ABS systems. Some ABS computers have 'dead-ends' that aren't bled without a scan tool. But it also means air is unlikely to get in unless the ABS valves are replaced. But if air in the ABS is suspect then a 'shade-tree' method to cycle the ABS is to jam on brakes on a slippery road (dirt, mud, sand, snow). When the ABS valves cycle, any old fluid and air will be expelled. Of course, this means your brakes may be dramatically (and negatively) affected by the sudden introduction of air into the system - be careful with this method! Once you get the vehicle safely home, bleed the brakes again to get rid of the air and dirty fluid.
    Kirk
    Norwalk, CT

  10. #10

    Default

    Quote Originally Posted by udderchaos View Post
    If I pull my ABS fuse, will it turn the ABS light on.? With the fuse pulled does it have any effect on the braking abilities.? This is on my 99 GMC K3500 Dually. I pull a trailer and don't need any more surprises...
    It seems obvious but you will now be able to lock the brakes up and slide. I unplugged all of the connectors from the module under the hood and I don't have any ABS lights on.
    Dan
    1999 GMC Sierra 2500 350 vortec
    1967 Jeep M725 ambulance 230 tornado
    1990 Cherokee Limited- 3 inch lift on 33's
    ...and every one of em has issues

    If you have any questions or problems don't hesitate to send me or any other GMTC moderators a PM

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