Help needed identifying hissing sound

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by JulienZ, Jul 30, 2025 at 6:59 PM.

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  1. JulienZ

    JulienZ New Member

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    Vehicle:
    2012 Prius
    Model:
    Three


    Hello!

    After the BRAKE / ABS / anti-slip lights went on, the ABS module and one wheel
    Speed sensor have been replaced.

    But I just noticed this hissing sound that seems to originate from the pedals area. It comes on and off when the accelerator pedal is pressed (even very slightly like on the video) or the break pedal depressed.

    Any idea of what it is?

    Thank you!

    Julien

    —-
    2012 Prius 3
    140,000 miles
     
    #1 JulienZ, Jul 30, 2025 at 6:59 PM
  2. Tombukt2

    Tombukt2 Senior Member

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    Some kind of air leakage apparently I would have to be doing is putting my head down they're and pushing pedal w hand . There's not a whole lot down they're . The piston that's pushed in whilst pushing with you're foot is about only thing that makes sense . Is their brake fluid in tube/s leading to brake fire wall parts ?
     
    #2 Tombukt2, Jul 31, 2025 at 7:08 AM
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