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Brake warning on startup

Discussion in 'A4/S4 forum(B5 Chassis)' started by imported_VaulterTim, Nov 22, 2005.

  1. imported_VaulterTim
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    imported_VaulterTim Guest

    Hi all,

    As subject I have the brake warning light come on at startup. The exclamation mark with three loud chimes.

    Brakes work fine. ABS works fine, I tested /ubbthreads/images/graemlins/wink.gif

    This all seemed to start when I picked my car up from the bodyshop a few weeks ago and to be fair has only happened a handful of times since...

    Does anyone know what may be causing it?

    Dirty/dusty sensor somewhere? Maybe the cold weather? The battery went flat at the bodyshop, maybe that..?

    Cheers

    Tim
    #1
  2. hop2407
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    hop2407 Active Member

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    Low Brake fluid ? Brake pad sensors now visible...... ?

    A couple of obvious suggestions I know......
    #2
  3. imported_VaulterTim
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    imported_VaulterTim Guest

    Nope, it's neither of those...
    #3
  4. imported_mc119856
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    imported_mc119856 Guest

    When you get warining does the yellow ABS light remain on?
    #4
  5. imported_VaulterTim
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    imported_VaulterTim Guest

    It's not the ABS, no yellow light. It's the red exclamation mark that beeps three times.

    It only presents when the engine starts too... not when the ignition is turned on /ubbthreads/images/graemlins/confused.gif
    #5
  6. joost
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    joost Active Member

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    Strangely enough, I'm having the same problem. I thought it might have been the wear sensors on the pads too.

    Be just my luck, it'll be summat that'll cost more than the car to repair (about a tenner!).
    #6
  7. easytease
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    easytease cheesypeas

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    is the light in question not the handbrake light?
    #7
  8. imported_VaulterTim
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    imported_VaulterTim Guest

    No.

    Does your handbrake light have an exclamation mark and chime at you three times?
    #8
  9. madvw
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    madvw Active Member

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    let me guess, iff you turn the ignition off and back on again (even without starting the engine), it doesnt happen again, nor for the rest of the day...
    #9
  10. imported_VaulterTim
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    imported_VaulterTim Guest

    Correct.

    Although I'm sure there was at least one occasion when it did.

    Odd.
    #10
  11. easytease
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    easytease cheesypeas

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    [ QUOTE ]
    No.

    Does your handbrake light have an exclamation mark and chime at you three times?

    [/ QUOTE ]

    i know in fords they do, and seeing as i am yet to purchase my audi, i wouldnt know
    #11
  12. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    This happens to me once in a while. Nothing to worry about. I think sometimes the ABD ECU doesnt boot up properly before the ECU does a check on it.

    Rich
    #12
  13. madvw
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    madvw Active Member

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    happened to me all the time on my old A4. Especially when it had been a cold night, and then again if there had been a dramatic temperature change during the day.

    I never did get to the bottom of it. To be honest, i didn't try too hard at diagnosing it either, as the brakes were still working fine. In addition, i assumed that if it was a real problem, it would tell me every time i started the car, not just in certain conditions.
    #13
  14. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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    I have had it once, and that was after a dramatic temp change, i wouldnt worry unless it's re occuring
    #14
  15. Soupie69uk
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    Soupie69uk Owner

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    My car did it for a couple of months about a year ago.

    Maybe the temp is affecting your fluid level, or just affecting the sensor.
    #15
  16. Soupie69uk
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    Soupie69uk Owner

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    Link

    Thats the thread i posted about a while ago.

    Cheers.
    #16
  17. CJ A4
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    CJ A4 Active Member

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    I got this too for a while. Started flashing every now and again then it began doing it every 30 seconds and beeping. Went and put some brake fluid in and it went away. Be sure that when you put the fluid in you have a screwdriver to push between the plastics at the mouth of the resevouir which will allow it to drain down otherwise it doesn't. Thats what happened to me anyway at the dealers. Good luck /ubbthreads/images/graemlins/wink.gif
    #17
  18. The911SC
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    The911SC Active Member

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    I am pretty sure its the level sensor. I had this on my A4 and took it into the dealership and apparently it happens a lot on A4's.
    Just check that the warning comes one on a flat surface rather than a slope. Sounds obvious I know, but I just topped it up slightly and it fixed it!.
    #18
  19. cloggs
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    cloggs New Member

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    I had this problem about a year ago. Turned out to be a dodgy battery of all things.

    Something to do with the voltage level being too low in the controller and tripping the error.

    I would have the error everytime I left the car for more than a day or if it has been a particularly cold night.

    Anyway, I changed my battery and it's been fine ever since...

    Hope that helps,

    Chris.
    #19
  20. imported_VaulterTim
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    imported_VaulterTim Guest

    Hmmm, interesting.

    The car is always parked on a flat surface so I doubt it's related to the level.

    As I said before, the battery went completely flat at the bodyshop whilst the car was in having it's bit's 'n' pieces done and the fault appeared for the first time the day I picked it up from there...

    I'm not sure if they completely recharged it because I remember them having problems with their charger. I'll charge it myself then see how we go, although the fault is so intermittent that I may not see it again.

    Thanks for everyone's input, nice to know I'm not the only one with this problem.

    Best wishes

    Tim
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  21. joost
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    joost Active Member

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    Cheers for that fellas, couple of easy fixes to try there. I'm leaning towards the low battery charge as I've only been doing shortish trips recently and with the cold & frost, had heater/heated screen, lights etc on, also park on a level.

    Many thanks for the suggestions, much appreciated /ubbthreads/images/graemlins/ok.gif
    #21
  22. cloggs
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    cloggs New Member

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    I was told to check my voltmeter level before starting the car. It should show just over 12 volts, anything lower and the battery is not charging properly/wearing out. Whether that is fact or not, I have no idea.

    I think mine was reading not much over 11 volts by the time I changed the battery. Although the car would start okay, it had gotten to the point where I was always getting the 3 chimes/DIS symbol if I left the car for anything more than a few hours.

    Chris.
    #22
  23. imported_VaulterTim
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    imported_VaulterTim Guest

    /ubbthreads/images/graemlins/mad.gif Did it again this morning...

    It was freezing again though so no surprise... going to charge the battery over the weekend to see if that makes any difference. With snow forecast I guess I'll get to test out my theory! /ubbthreads/images/graemlins/grin.gif

    Cheers

    Tim
    #23
  24. imported_kris_tdi
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    imported_kris_tdi Guest

    funnily enough my mums smart forfour and a guy at works 1 series bmw do exactly the same.
    #24
  25. AndyC
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    AndyC Moderator Staff Member Moderator

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    timbo...

    pop it on my diagnostic kit at work.... see if there are any gremins obvious.
    #25
  26. imported_VaulterTim
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    imported_VaulterTim Guest

    Didn't think of that!

    Cheers bud, next time I'm down that way we'll ruffle her feathers /ubbthreads/images/graemlins/grin.gif
    #26
  27. imported_VaulterTim
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    imported_VaulterTim Guest

    Well... she's still doing it (intermittently still) and after a lot of investigating I have found this (stumbled across it actually)...


    WARNING LAMP FOR BRAKE SYSTEM

    FAULT: Warning lamp for the brake system comes on after cold start.

    CAUSE: In the ABS control unit is a poor recognition of low voltage and the acoustic and optical warning is activated by unsatisfactory indication suppression in the instrument cluster.

    SOLUTION: Fit the ABS unit with a low voltage relay.



    This seems to be a fairly practical solution... but we're back at the low voltage problem again. Just as a note, I haven't actually charged my battery yet /ubbthreads/images/graemlins/blush2.gif Voltage levels are fine so I didn't see any point...

    Thoughts?

    T
    #27

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