Brake Booster hissing

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Thread: Brake Booster hissing

  1. #1
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    Default Brake Booster hissing

    2001 Sequoia Limited 4X4 - the brake booster is hissing loudly and diminishes when the brake pedal is pushed or engine speed increases. Does anyone know just what is defective and what part is required to correct it? Is it a simple seal or the complete booster? I cannot find breakdown diagrams of the booster components, so it remains a "mystery". The braking performance appears normal, so I wonder just how serious this leaking is to overall function. The vehicle has skid control, which is important when considering the booster replacement.
    Any thoughts would be appreciated.

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  3. #2
    Junior Member TuRDs/c's Avatar
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    Default Re: Brake Booster hissing

    Sounds Like A Vacuum Leak. Check The Hoses If They Are Tight And Not Cracked Then Its In The Booster. I Don'tKnow Enough To Tell You If You Can Fix It Or Have To Replace It Though. Good Luck.

  4. #3
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    Default

    Had the same problem on my 2003 sequoia, dealer replaced brake booster under warranty.


    Sent from AutoGuide.com Free App

  5. #4
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    Default Re: Brake Booster hissing

    Air leak around the pushrod seal. Booster is non-serviceable unfortunately. Must be replaced. $$$$.

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