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Saab 93 making quiet hissing noise

  • 04-03-2010 11:23am
    #1
    dinneenp
    Registered Users, Registered Users 2 Posts: 8,214 ✭✭✭


    Hi,
    I have a 2002 Saab 93.
    I've noticed that the car makes a quiet hissing noise sometimes (going on for months). If I touch the brake pedal (very slightly, doesn't slow the car 1%) that the hiss is gone.

    It's just a hissing as far as I know, doesn't seem to have any other effect.

    Just wondering if anyone has any idea what it could be and do I need to do anything about it?
    Cheers,
    Pa.


Comments

  • #2
    Anan1
    Registered Users, Registered Users 2 Posts: 22,815 ✭✭✭✭Anan1


    Is the noise only there while the car's moving? Does it vary with speed? Does it disappear when you dip the clutch?


  • #3
    dinneenp
    Registered Users, Registered Users 2 Posts: 8,214 ✭✭✭dinneenp


    Anan1 wrote: »
    Is the noise only there while the car's moving? Does it vary with speed? Does it disappear when you dip the clutch?


    Only when moving, will check today re the other bits...


  • #4
    Saab Ed
    Closed Accounts Posts: 5,374 ✭✭✭Saab Ed


    There's a vacume pipe that runs into the back of the master cylinder and is known to corrode, this will cause the noise you're talking about. Have you noticed the brake pedal getting any harder and the brakes being a bit less responsive?


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