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Hissing noise from braking system

Discussion in 'Engine Compartment' started by jumu, May 23, 2011.

  1. jumu

    jumu Superiore

    Messages:
    969
    Chennai
    Friends,

    My Punto has covered 35,000 kms and since the last 1000 kms I have been hearing a hissing noise from the right side near the aircon vent, its not exactly thru the vent but in that area This hissing noise begins when the engine is started and the reason I have said it maybe attributed to the braking system is because the noise stops when I touch the brake pedal. Braking otherwise is normal and I don't have any issues. The noise it faint but I know it is a new noise and hence my attention is drawn. I had shown this problem to teky and ramjin when I met them a the chennai meet recently and they too acknowledged it is not normal

    I took my car to TASS Tafe Reach and just demonstrated the problem to the technician and SA. I told him not to do any trail and error method and requested him to consult with FIAT engineers and tell me about the diagnosis. I haven't left the car with them

    I suspect it could be the brake booster or the vacuum generator. What could it be?


    Abdul
  2. gurjinder

    gurjinder Staff Member Janitor

    Messages:
    3,989
    Punjab
    Is it coming only on idling or only when the car is in motion or both?
  3. jumu

    jumu Superiore

    Messages:
    969
    Chennai
    The noise is present during idling as well as in motion.
  4. gurjinder

    gurjinder Staff Member Janitor

    Messages:
    3,989
    Punjab
    Thats a googly, mate.

    But it points to a vacuum leak either from :
    -the piping(vacuum pump to brake booster)
    -the brake booster itself

    Your vacuum pump seems fine and doing its job as the hiss is the air being sucked in.

    Gurjinder.
    P.S. Are you experiencing a slow deterioration in brake performance? Pedal becoming harder kind.
    Last edited: May 24, 2011
  5. i doubt the piping. it must have got a small leak causing this problem..

    OT

    i have a similar sound coming from the rear end(audible outside the car only) when i start it..
    is this normal??? pssssssss sort of sound like air is leaking sort of sound..
  6. teky

    teky Esperto

    Messages:
    1,587
    Chennai
    Isn't that the fuel getting inside or something of that sorts?
  7. soccerfan

    soccerfan Regolare

    Messages:
    480
    Kochi
    I think its the fuel pump doing its job
  8. is that sound common??
    coming from the rear end. could not hear from which side though was in a parking lot...
    and is this normal??
  9. soccerfan

    soccerfan Regolare

    Messages:
    480
    Kochi
    ^ i have heard it in all Puntos. Its normal. No need to worry
  10. bhai

    bhai Esperto

    Messages:
    1,185
    Ahmednagar
    Grande Punto 1.3 90 HP
    Don't worry. That sound is of low pressure fuel pump (located in fuel tank)
    Low pressure fuel pump brings the fuel upto your engine.

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