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Thread: Quattro ABS Sensor woes...

  1. #1
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    Quattro ABS Sensor woes...

    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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    Geeman's Avatar
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    Sounds like you've nailed it.
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    "Stick a V8 in it!"

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    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 crap and fitted a new brass sleeve.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
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    Geeman's Avatar
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    "Rust makes the hole smaller"... tee hee!
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    Pulsating brake pedal getting worse but no ABS light?

    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.

  7. #6
    "Stick a V8 in it!"

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    Pulsing at low speeds is usually a damaged reluctor.

    If its a quattro its likely a rear one.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
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  8. #7
    spartacus 68's Avatar
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    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.
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    PAULF likes this.
    2002 A2 1.4 TDi SE (125k)
    2001 A4 2.5 TDi Avant Quattro Sport (155k)
    1995 80 TDi Avant SE (175k) Sold

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    Thanks both of you. As the light isn't on is this likely to be an MOT failure do you know?

  10. #9
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    Dont replace it, Upgrade it !!

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    If its not on and the decelerometer readings are good i shouldnt see why it wouldnt pass TBH !!
    1999 Audi A4 1.8T Quattro Sport - Volcano Black

    Mods - Frankenturbo F4 Kit - THS Decat - Milltek - ECS Crank Pulley - 034 Snub + Bracket/Gbox Mounts - 1Z/S2 Clutch + Flywheel - 007p - ICM + EVAP Delete - S4 B6 345mm Brakes - 300mm Rear Brakes - Goodridge Hoses - LCR Splitter -S4 Bumbers + Skirts/Mouldings - OEM Xenons - Apikol Diff mounts - Polytek'd Rear Diff Mount
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  11. #10
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    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

    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.
    spartacus 68 likes this.
    1999 A4 B5 1.9 TDi FWD Saloon, Green
    2000 A4 B5 2.5 TDi Quattro Avant, Maroon, 'Panzer' Plated (currently sporting wrecked engine)
    2000 A4 B5 2.5 TDi Quattro Saloon, Blue, 'Panzer' Plated, Cruise Control retrofitted, OEM 6 Disc Changer retrofitted

 

 

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