Servo thingy, anybody know what it is and what it does?

Discussion in 'Chassis' started by Jon Olds, Aug 14, 2022.

  1. Jon Olds Forum Junkie

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    1998 Audi A3 although I think all mk4 golf platforms of this era have it
    Five black wires go to it.
    Is it a sensor (transmitter)?
    Is it a valve to brake the vacuum (i hope not)
    Help appreciated
    thanks
    Jon servo thingy.jpg
     
  2. Jon Olds Forum Junkie

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    Nobody?
    Jon
     
  3. dodgy

    dodgy Paid Member Paid Member

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    Not sure, but I know bmw have a vacuum sensor, and is used in certain conditions, like start stop, but not sure on audi at that age, not much help.
    Is it worth looking up on etka, 7zap etc to see what attachments are on the servo, or part number to Google? Sorry not got time at mo, but will try later.
     
  4. dodgy

    dodgy Paid Member Paid Member

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  5. Jon Olds Forum Junkie

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    Thanks, I have just found a reference to a vacuum sensor ploughing through my old haynes manuals, so I hoping that's all it is.
    Jon
     
  6. dodgy

    dodgy Paid Member Paid Member

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    Looking at the a4 info it's more brake pedal related, know that you can alter stuff on them with vcds or something, read it when looking at brake upgrades for mine ages ago. And mentions esp, so if not wanting all that gubbins I'd Try it without .
     
  7. Jon Olds Forum Junkie

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    Yeah, just had engine box out to get at servo, and replaced it, because it was leaking. Long story.
    Anyway, cant see it being a vent valve, as that would cause brake failure, potentially...
    Jon
     
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  8. rubjonny

    rubjonny Administrator Staff Member Admin

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    brake pressure sensor
    Clipboard01.jpg
     
  9. Jon Olds Forum Junkie

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    Thanks Jonny.
    Car is now loaded, ready for a double header autocross at Witney, Oxfordshire this weekend.
    Brakes are A ok.
    Can't wait...
    Jon
     

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