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Quattro ABS Sensor woes...

Discussion in 'A4/S4 forum(B5 Chassis)' started by mixmaster, Sep 21, 2011.

  1. mixmaster
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    mixmaster Member

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    [Sep 21, 2011]
    Since destroying the front ABS sensor thinking I had to remove it during a CV boot change it took some care with a rubber mallet to reinstall the new one into its new copper cage.

    Is this normal?

    Although I haven't paid too much attention to measurements it seems to have gone in ok (I didn't push it too far) and no longer have the ABS dash light on.

    Does lack of warning light mean everything should be fine safety wise?

    Thanks in advance.
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  3. Geeman
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    Geeman Low Life

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    [Sep 22, 2011]
    Sounds like you've nailed it.
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  4. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Sep 22, 2011]
    It should just slide in.

    The upright gets rusty though, and the rust makes the hole smaller. Ideally you'd have used a round file to clean out all the **** and fitted a new brass sleeve.
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  5. Geeman
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    Geeman Low Life

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    [Sep 22, 2011]
    "Rust makes the hole smaller"... tee hee! :busted_cop:
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  6. mixmaster
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    mixmaster Member

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    [May 18, 2013]
    Sorry to resurrect this thread.

    Although I have had the ABS light on the dash I haven't seen it for a long time now; However, the pulsating at slow speeds is progressively getting more frequent.

    Would you blame the ABS module in this case or the sensor?

    Thanks in advance.
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  7. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [May 18, 2013]
    Pulsing at low speeds is usually a damaged reluctor.

    If its a quattro its likely a rear one.
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  8. spartacus 68
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    spartacus 68 Active Member

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    [May 18, 2013]
    Agree with aragorn's suggestion and split reluctor ring. Remove driveshaft - by undoing splined bolts at inner cv joint.

    Did the same job myself last year. Remove existing ring, and thoroughly clean area prior to fitting new ring, a light smear of grease will help too. Heat the new ring with a blow torch until cherry red. Fitting it cold is likely to pose problems.

    Looks like this.

    Attached Files:

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  9. mixmaster
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    mixmaster Member

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    [May 28, 2013]
    Thanks both of you. As the light isn't on is this likely to be an MOT failure do you know?
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  10. Bradderz_1988
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    Bradderz_1988 Dont replace it, Upgrade it !!

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    [May 28, 2013]
    If its not on and the decelerometer readings are good i shouldnt see why it wouldnt pass TBH !!
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  11. PAULF
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    PAULF Active Member

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    [May 28, 2013]
    Mine passed with it pulsing no problem. I did change one of the Avant rears for new and repaired the other rear Avant and one rear saloon as they weren't cheap (Mentioned in here - How to replace front and rear suspension parts (with pics) )

    Beware though, it takes somebody from Aberdeen to save money by repairing these :icon_thumright:

    As Spartacus says, you need to clean the seat well and heat the ring to cherry red. Pop it on and push it home with an old screwdriver or similar.
    #10
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