Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Please note that it is not permitted to have referral links posted in your signature. Keep these links contained in the appropriate forum. Thank you.

https://www.boards.ie/discussion/2055940817/signature-rules
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Brake pedal went stiff. Hissing noise now from pedal

  • 08-02-2018 6:18pm
    #1
    adocholiday
    Registered Users, Registered Users 2 Posts: 2,016 ✭✭✭


    Hi all,

    Was driving home from work and noticed that the brake pedal was a bit stiff but working OK. When I got home then I tried it out and when I press the brake there's a hissing noise coming from the pedal. Only when I press the pedal, not constant.

    Anyone know what it might be. 2010 Audi A4 2.0 diesel btw


Comments

  • #2
    Atlantic Dawn
    Registered Users, Registered Users 2 Posts: 84,761 ✭✭✭✭Atlantic Dawn
    M


    Check the brake fluid to see what level it's at.


  • #3
    rex-x
    Registered Users, Registered Users 2 Posts: 1,893 ✭✭✭rex-x


    Vacuum leak probably, these have a dedicated pump just for the brakes. Could be servo itself or pipe


  • #4
    jca
    Closed Accounts Posts: 8,585 ✭✭✭jca


    Pump the pedal with the engine stopped until it goes hard. Keep your foot pressed on the pedal and it should sink away from you when you start the engine. If that happens the servo is working properly so you won't need to worry unduly. There's a rubber bellows around the push rod where it enters the servo and that's probably split which is causing your hissing. See if it's happening with the brake pedal pressed and stopping when it's released.


  • #5
    adocholiday
    Registered Users, Registered Users 2 Posts: 2,016 ✭✭✭adocholiday


    Thanks all,

    I tried JCA's suggestion and it worked as he said. 3 or 4 pumps and the pedal wasn't really budging, turned on the engine and it dropped as said. The hissing noise also isn't constant, only when the brake is pressed. Fingers crossed it's just the vacuum and not the servo.


Advertisement