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  1. #1
    Senior Member Two Rings pearlescent's Avatar
    Join Date
    Feb 14 2009
    AZ Member #
    38690
    My Garage
    05 allroad 6sp, 2010 Infiniti EX35
    Location
    Milford Michigan

    ABS engages everytime I brake wtf?

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    So I changed out my rear wheel bearings, rotors and pads. Everything went smoothly. Now almost every time I hit the brakes my ABS engages. I can feel the pulsating in the pedal and can hear the typical noise from the master cylinder. ABS light is not on. I did not bleed the brakes when I retracted the caliper piston, I've heard that this can cause problems.... HELP!
    -Matt
    Current: 05 allroad 2.7t 6spd
    Past: 04 S4 Cab 6spd, 96 A4 2.8 quattro 5spd

  2. #2
    Established Member Two Rings Vrdady's Avatar
    Join Date
    Mar 21 2007
    AZ Member #
    16616
    Location
    VA

    Re: ABS engages everytime I brake wtf?

    Quote Originally Posted by pearlescent View Post
    So I changed out my rear wheel bearings, rotors and pads. Everything went smoothly. Now almost every time I hit the brakes my ABS engages. I can feel the pulsating in the pedal and can hear the typical noise from the master cylinder. ABS light is not on. I did not bleed the brakes when I retracted the caliper piston, I've heard that this can cause problems.... HELP!
    typical of bad ABS sensor. but since you did your brakes I'd suggest going back and making sure you didn't break or unplug something.
    If your Audi isn't quattro, Why did you buy it?

  3. #3
    Established Member Two Rings Dre_audi's Avatar
    Join Date
    Oct 24 2009
    AZ Member #
    49702
    My Garage
    tricycle
    Location
    toronto

    Re: ABS engages everytime I brake wtf?

    My advice is to go back and check if you left anything unplugged or damaged anything this happened to me and it turned out my mechanic did not put the sensor back in properly good luck

  4. #4
    Veteran Member Three Rings Crispy222's Avatar
    Join Date
    Mar 15 2008
    AZ Member #
    26462
    Location
    Syracuse, NY
    Items for Sale

    Re: ABS engages everytime I brake wtf?

    defiantly a sensor issue.

  5. #5
    Senior Member Two Rings
    Join Date
    Nov 15 2009
    AZ Member #
    50748
    Location
    Derry NH

    Re: ABS engages everytime I brake wtf?

    If the rear sensors are anything like the front you probably just moved one of the sensors slightly out of the hole when you removed and installed your rear axels. Try pushing them back in before you try diagnosing a faulty sensor. This happens to me alot when I do front cvjoints or replace axles Usually pushing the sensor back in fixes it.
    Last edited by dangerous_dave; 02-01-2010 at 02:30 AM.

  6. #6
    Senior Member Two Rings pearlescent's Avatar
    Join Date
    Feb 14 2009
    AZ Member #
    38690
    My Garage
    05 allroad 6sp, 2010 Infiniti EX35
    Location
    Milford Michigan

    Re: ABS engages everytime I brake wtf?

    okay, thanks guys I'm gonna pull them out and try to make sure they are fitted properly.

    Is it safe to say that if my ABS light isn't on the sensors are still okay?
    -Matt
    Current: 05 allroad 2.7t 6spd
    Past: 04 S4 Cab 6spd, 96 A4 2.8 quattro 5spd

  7. #7
    Veteran Member Four Rings walky_talky20's Avatar
    Join Date
    Jun 30 2008
    AZ Member #
    30427
    Location
    Erie, Pennsylvania

    Re: ABS engages everytime I brake wtf?

    I've heard cleaning the end of the sensor off can help sometimes as well. If it gets some rust or metal chips stuck to it, it can affect the reading.

    This is why it is sometimes advised not to remove the wheel speed sensor when replacing the rear wheel bearing. Just unplug it under the seat, fish the wire through the grommet, and leave it attached to the hub during the procedure. That's how I did it, I didn't want to risk breaking it as they often get seized in there pretty good.

  8. #8
    Senior Member Two Rings pearlescent's Avatar
    Join Date
    Feb 14 2009
    AZ Member #
    38690
    My Garage
    05 allroad 6sp, 2010 Infiniti EX35
    Location
    Milford Michigan

    Re: ABS engages everytime I brake wtf?

    Quote Originally Posted by walky_talky20 View Post

    This is why it is sometimes advised not to remove the wheel speed sensor when replacing the rear wheel bearing. Just unplug it under the seat, fish the wire through the grommet, and leave it attached to the hub during the procedure. That's how I did it, I didn't want to risk breaking it as they often get seized in there pretty good.
    Yup, I found this out from my Bentley manual today... wish i would have known before I started twisting the sensor out. I found out that i cracked the magnet in the sensor, not tripping the ABS light but causing a bad reading. For now, no ABS for me. I replaced my wheel bearings and screw up my ABS, seems so typical of B5 maintenance haha
    -Matt
    Current: 05 allroad 2.7t 6spd
    Past: 04 S4 Cab 6spd, 96 A4 2.8 quattro 5spd

  9. #9
    Veteran Member Three Rings chris164935's Avatar
    Join Date
    Apr 18 2007
    AZ Member #
    17395
    My Garage
    2001 Audi A4 1.8tQM
    Location
    Orange Park, FL
    Items for Sale

    Quote Originally Posted by pearlescent View Post
    Yup, I found this out from my Bentley manual today... wish i would have known before I started twisting the sensor out. I found out that i cracked the magnet in the sensor, not tripping the ABS light but causing a bad reading. For now, no ABS for me. I replaced my wheel bearings and screw up my ABS, seems so typical of B5 maintenance haha
    Was the cracked magnet in the sensor visibly obvious?
    "You know you have a bad idea when Ford guys are making fun of you."
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  10. #10
    Senior Member Two Rings pearlescent's Avatar
    Join Date
    Feb 14 2009
    AZ Member #
    38690
    My Garage
    05 allroad 6sp, 2010 Infiniti EX35
    Location
    Milford Michigan

    Quote Originally Posted by chris164935 View Post
    Was the cracked magnet in the sensor visibly obvious?
    Yup, the casing and the magnet itself were completely severed haha
    -Matt
    Current: 05 allroad 2.7t 6spd
    Past: 04 S4 Cab 6spd, 96 A4 2.8 quattro 5spd

  11. #11
    Registered Member One Ring
    Join Date
    Feb 17 2012
    AZ Member #
    88362
    Location
    providence

    im having the same issue, im hoping it will just be dirty sensors or metal stuck to the end of it, from when i had to bangout the old one. its super dngerous to drive now i come to stop signs andat 5 mph cant stop i have to use the ebrake to coax myself to a stop, can i just unplug the abs sensor to stop this, id rather have no abs then NO Brakes, thanks.

  12. #12
    Senior Member Two Rings
    Join Date
    Jan 21 2008
    AZ Member #
    24370
    Location
    Tucson

    Pull the ABS fuse, I believe.

  13. #13
    Veteran Member Four Rings FNK's Avatar
    Join Date
    Mar 07 2010
    AZ Member #
    55703
    My Garage
    Audi A4 2.8L 2001 Quattro Tip
    Location
    Montréal, Éts

    This also happened to me, it wasn't the sensor, it's the ABS ring who splitted in two. Welding it didn't worked.
    You can use VAG to identify this problem under ''Abs ... out of run somthing''... well this was of no help

  14. #14
    Registered Member One Ring B5Bandit$'s Avatar
    Join Date
    Feb 24 2012
    AZ Member #
    88748
    Location
    Littleton/CO

    This also happens to me sometimes, but it seems it only happens on inclines or when breaking in dips in the road.

  15. #15
    Veteran Member Four Rings $teady$upreme's Avatar
    Join Date
    Feb 11 2004
    AZ Member #
    102
    My Garage
    99.5 A4 28RS 1.8TQS VolcanoBlk
    Location
    Vancouver, BC Canada

    Quote Originally Posted by B5Bandit$ View Post
    This also happens to me sometimes, but it seems it only happens on inclines or when breaking in dips in the road.
    Did you find out what your problem is?
    David L.
    www.FormaTuning.com
    www.VancouverAudiClub.ca
    99.5 A4 GT28RS 1.8TQSM Volcano Black & 99 CW Acura Integra Type-R #0010

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  16. #16
    Registered Member One Ring
    Join Date
    Apr 12 2012
    AZ Member #
    91730
    Location
    ky

    i have the same issue only the ABS only engages from about 20mph down to the 13mph range. It pulsates while slowing down, just at those speeds though. Once above or below that range the brakes and ABS work fine. I had brakes and both front axels replaced in the last 3 weeks. should I just check all the sensors before ordering new ones??

  17. #17
    Veteran Member Three Rings wildbill's Avatar
    Join Date
    Jan 25 2010
    AZ Member #
    53898
    My Garage
    87 300zx, a motor and transmission apart from a b7, the remains of my b5 and a lawnmower
    Location
    raleigh nc

    for those who have issues. a fix it...or b ....unplug the harness. i ran my car that way for two years never had an issue. not ideal, but it helps. my car would lock the driver rear while going down the highway. i will say this...never buy a car from certain foreigners....f'n liars. and its not the first time its happened.
    boost. a new band aid by Johnston&johnston

  18. #18
    Veteran Member Three Rings wildbill's Avatar
    Join Date
    Jan 25 2010
    AZ Member #
    53898
    My Garage
    87 300zx, a motor and transmission apart from a b7, the remains of my b5 and a lawnmower
    Location
    raleigh nc

    i almost forgot...ive got an abs control module and 4 sensors for sale :). and yes....THIS stuff works
    boost. a new band aid by Johnston&johnston



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