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Vacuum noise by brake pedal?! What is this craziness! 700

posted by  überbox on  Sun Sep 26 11:46 CST 2004
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last visit: Thu Nov 1 16:21 CST 2001
[RELATED]

88 volvo 740 turbo with 250k.

I started up car after washing it this afternoon and I noticed a hissing noise coming from my feet. Ruling out voodoo and Ohio serpents, I undid the bottom cover to inspect what was goin on. The noise, which sounds like a vacuum leak, is coming from the plunger that goes in to the firewall and is connected to the brake pedal. When I push in the brake pedal the hissing subsides.

Anyone had this happen before? What is this and what should I do?


Jes








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    Vacuum noise by brake pedal?! What is this craziness! 700

    posted by  porkface on  Sun Sep 26 12:59 CST 2004
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    last visit: Fri Oct 24 09:12 CST 2014
    [RELATED]

    the booster is leaking and you need to replace it. good luck, chuck.








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      Vacuum noise by brake pedal?! What is this craziness! 700

      posted by  keithrigby on  Sun Sep 26 13:07 CST 2004
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      last visit: Sat Sep 15 14:39 CST 2012
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      Sounds to me like the pipe has come off the vacuum valve which is an emergency release for the cruise if the electronics fail.bet your cruise isn't working?
      The valve may be damaged or faulty if the pipe hasn't come off.

      Best of luck with your head down in the pedals,but you could scrape off the chewing gum while you're there.








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        Vacuum noise by brake pedal?! What is this craziness! 700

        posted by  someone claiming to be brianc on  Sun Sep 26 13:35 CST 2004 [RELATED]

        twas my first thought reading the subject, but the description of where the hissing is coming from and that it goes away with pedal depressed - makes me depressed. Boosters aren't fun.








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          Vacuum noise by brake pedal?! What is this craziness! 700

          posted by  überbox on  Mon Sep 27 15:16 CST 2004
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          last visit: Thu Nov 1 16:21 CST 2001
          [RELATED]

          craaaaaaaap. That is what I suspected. And the brakes are acting like they have air in the lines. Which they don't. Squishy pedal and my ABS coming on when it isn't supposed to although that is probably due to dirty sensors. Hmmm. Thanks for the help- I'll take a crack at the Juicy Fruit while I'm down there.


          Jes







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