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Thread: Hissing brake pedal - should I worry?

  1. 15th April 2010, 07:38 AM #1
    DiscoMick Guest

    Hissing brake pedal - should I worry?

    Brakes didn't feel right, extra effort to pull up, so I took them to a local crowd who reckoned everything seemed OK, hoses seemed fine, but said they drained the brake fluid and flushed it to make sure there wasn't a blockage.
    Now when I press the brake pedal there is a brief hissing noise from down near the pedal. It seems to pull up alright.

    I have a separate problem with the anti-lock brake warning light not going off which I need to get fixed, but I was assuming it would still stop OK without the anti-lock. Trying to avoid a big bill on the anti-lock for a month because of other commitments.

    Whattayoureckon?
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  2. 15th April 2010, 07:55 AM #2
    Mick_Marsh's Avatar
    Mick_Marsh
    Mick_Marsh is offline Swaggie
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    I have a similar problem on my 101 since I changed the master cylinder. I'd be interested in reading the replies.
    regards
    Mick
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  3. 15th April 2010, 08:05 AM #3
    bee utey's Avatar
    bee utey
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    The system may not be 100% bled after the fluid change, the short hiss when depressing the pedal is normal booster action.
    The ABS sensors might be dirty, or the connectors loose. Something you can check reatively easily.
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  4. 15th April 2010, 10:32 AM #4
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    loanrangie
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    Constant hiss means the diaphram in the booster is split but as above a short hiss is normal.
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  5. 15th April 2010, 11:23 AM #5
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    isuzu110
    isuzu110 is offline Master Supporter
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    Check where the master cylinder attaches to the booster for hairline fatigue cracks. Common 300TDI problem.
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  6. 15th April 2010, 06:03 PM #6
    DiscoMick Guest
    The booster was recently repaired because it was leaking. Since then we have the hiss...
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  7. 15th April 2010, 09:29 PM #7
    bee utey's Avatar
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    Quote Originally Posted by DiscoMick View Post
    The booster was recently repaired because it was leaking. Since then we have the hiss...
    Aah, then the inlet filter at the pedal end is clean. If it's blocked with carpet fluff it's muffled.
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  8. 15th April 2010, 09:31 PM #8
    DiscoMick Guest
    So, that's good then?
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  9. 15th April 2010, 09:41 PM #9
    bee utey's Avatar
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    Quote Originally Posted by DiscoMick View Post
    So, that's good then?
    Faster brake boost action, must be good!
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