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audi 100 avant s4 1996 braking problem

Discussion in 'Classic Audi Forum' started by manji, Jan 5, 2011.

  1. manji
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    manji New Member

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    [Jan 5, 2011]
    Hi I have a problem with my Audi I was driving down the road when the brake warning light came on and I heard 3 beeps. I when I got hope I checked the fluid level and topped it up.

    I started the car up again and no light or beeps, I drove it round the corner and it started to beep again but this time the pedal went hard.

    Now when I put my foot on the pedal it is hard and when I start the car the pedal stays hard. Now I know this indicates the servo being faulty but I cant seem to find it. Any clues.

    It is a Audi 100 avant s4 quattro estate.

    cheers
    #1
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  3. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jan 5, 2011]
    I've looked in ETKA for you and it seems to suggest the servo on this car is a hydraulic affair, running perhaps from the PAS pump?

    This hydraulic system has some sort of pressure switch too, so perhaps the beeping was indicating a fault in this system?
    #2
  4. manji
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    manji New Member

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    [Jan 5, 2011]
    Thanks I will have a look.
    #3
  5. paul20v
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    paul20v Audi fanatic

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    [Jan 6, 2011]
    Definately a power servo ,
    and yes it runs off the PS pump .
    #4

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