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Hard brake pedal

Wzy Feb 28, 2017

  1. Wzy

    Wzy New Member

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    Hi yall. My '02 audi a4 b6 brake pedals are rock hard causing vehicle not to stop when I want it to. Anyone have this problem? Recently changed the brake master cylinder and brake pads. Could it be the brake booster..? Please help.
     
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  3. Baka

    Baka Active Member

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    It does sound like no vacuum to the servo or a faulty servo.
     
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  4. DieselJake

    DieselJake Well-Known Member VCDS Map User

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    Mines got a split brake booster and is intermittently very stiff so I'd definately give that a check (which reminds me to get mine sorted).
     
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  5. QuattroCalum

    QuattroCalum Well-Known Member saloon Audi A4 Black Edition Saloon Manual

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  6. matt66604

    matt66604 Active Member VCDS Map User

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    If the master cylinder has recently been replaced then I'd check the vacuum pipe going into it is actually connected and not damaged, failing that, start the engine and put your head near the brake pedal and listen to see if you can hear a hissing noise beside the pedal , if it is then the diaphragms split inside the servo.
     
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  7. Wzy

    Wzy New Member

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    Sorted. It was the vacuum pipes. Replaced them and brakes now back to normal. Thanks guys.
     
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  8. QuattroCalum

    QuattroCalum Well-Known Member saloon Audi A4 Black Edition Saloon Manual

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    Glad to hear it was a cheap and easy fix, the best kind.
     
  9. mattyboyc

    mattyboyc B6 Veteran TDi Audi A4 Audi Avant Owner Group

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    Mine has just started to do this, how many pipes are there ? Or is it just the one from the pump to the servo that needs changing.
     
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  10. Wzy

    Wzy New Member

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    I'll send you pics in a bit.
     
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  11. Wzy

    Wzy New Member

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    Attached Files:

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  13. mattyboyc

    mattyboyc B6 Veteran TDi Audi A4 Audi Avant Owner Group

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    Thank you for that.
     
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  14. fazfrank

    fazfrank New Member

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    For mine you could here the leak right where hose passed through firewall. Top left corner of your image. Temporary fix I put a black piece of electrical tape around where it plugs into firewall. Worked. If you wiggle hose around you can hear the air leak and feel pulsating. A 2nd person was pushing brake and they got better as I wiggle that. So for now I put tape to act as like Teflon tape.
     
    Last edited: Dec 2, 2018

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