Question about Mazda Tribute

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I have a 2000 Mazda Tribute that developed a hissing noise coming from the floorboard area of the vehicle. I first was told that it was likely the brake booster. A trip to the mechanic and was told if it was the break booster, the brakes would be noticeably different. The breaks work fine and have been throughout the hissing noise. I was told that a gromit may have a crack that could be making this noise. It's annoying, but I do not want to spend a lot of money on this if the brake booster is not the problem. Do you have any suggestions? The noise comes and goes based on when I'm putting on the brakes or not. This has been going on for about 2 months now and can now notice a difference in the noise level when I operate the gas peddal

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  • mick401 Jul 22, 2009

    There is no smell involved with this, just an annoying noise that comes and goes. The fluid levels with both the brakes and coolant seem fine

  • mick401 Jul 22, 2009

    This noise sounds similar to the noise a bicycle pump makes when inflating a tire, but is consistent, and comes and goes with the level of effort I put on the brakes. Sometimes it disappears altogether for a few miles. Can you respond to the possibility that a gromit may be the issue? I've been told this gromit looks similar to a condom and if perforated, will let some noise in.

  • mick401 Jul 22, 2009

    I'll check out the exhaust possibility! Thanks

  • mick401 Jul 23, 2009

    I'll give it a try!



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Can you smell anything different like antifreeze inside car? Check coolant level too & make sure it hasn't gone down.Could be a coolant leak but I would doubt it. Otherwise I'd bet that you have an exhaust leak which is why you can notice it more when you step on the gas. You should be able to spot it while the car is running and even hear it. Let me know what you find.


Posted on Jul 22, 2009

  • Benjamin Patri
    Benjamin Patri Jul 22, 2009

    Then an exhaust leak would best explain your problem. If you have someone step on the gas, you should be able to see and hear it hopefully underneath the vehicle, maybe use a flashlight to see the smoke better.



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