Noise when in complete stop and brake pedal is depressed

Discussion in 'Gen 2 Prius Technical Discussion' started by MJ50, Jan 9, 2019.

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  1. MJ50

    MJ50 Junior Member

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    brake actuator assembly was replaced under warranty.
    this noise started sometime after.
    flushed brake fluid. no help.
    if i release the brake pedal just enough where car won't roll, the noise goes away temporarily.
    any idea what's wrong?

     
    #1 MJ50, Jan 9, 2019
  2. bisco

    bisco cookie crumbler

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    is the engine running?
     
    #2 bisco, Jan 9, 2019
  3. MJ50

    MJ50 Junior Member

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    yes
     
    #3 MJ50, Jan 9, 2019
  4. padroo

    padroo Senior Member

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    Is it coming from one side or both, front or back?
    If it is only coming from one wheel I would pull a wheel and take a look at it.
     
    #4 padroo, Jan 9, 2019
  5. bisco

    bisco cookie crumbler

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    i can't really hear it over the engine, can you record without the engine on?
     
    #5 bisco, Jan 9, 2019
  6. padroo

    padroo Senior Member

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    The engine was running?
     
    #6 padroo, Jan 9, 2019
  7. bisco

    bisco cookie crumbler

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    see post #3
     
    #7 bisco, Jan 9, 2019
  8. MJ50

    MJ50 Junior Member

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    it's coming from the front, definitely not from the back.
     
    #8 MJ50, Jan 9, 2019
  9. MJ50

    MJ50 Junior Member

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    i'll try to get a better clip next time
     
    #9 MJ50, Jan 9, 2019
    bisco likes this.
  10. bobodaclown

    bobodaclown Member

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    Hello, just had a similar experience. The repair shop was going to rebleed the brakes, when I brought the car in. I did several aggressive brake stops, up to 40 then full stops, enough to feel the antilock kicking in. It worked. Noise went away. I realize that's not an approved fix, but it worked in my situation. Your results may vary. ;)
     
    #10 bobodaclown, Jan 10, 2019
  11. MJ50

    MJ50 Junior Member

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    here's another video with ignition on

     
    #11 MJ50, Jan 15, 2019
  12. bisco

    bisco cookie crumbler

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    that's without the engine running?:eek:
     
    #12 bisco, Jan 15, 2019
  13. MJ50

    MJ50 Junior Member

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    correct. everything runs fine, but just a noise...
     
    #13 MJ50, Jan 15, 2019
  14. bisco

    bisco cookie crumbler

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    maybe the brake actuator, hard to tell. definitely sounds like a pump or motor.

    are there any trouble codes?
     
    #14 bisco, Jan 15, 2019
  15. MJ50

    MJ50 Junior Member

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    brake actuator was replaced under warranty and it was a different noise...
    no codes...
     
    #15 MJ50, Jan 15, 2019
  16. bisco

    bisco cookie crumbler

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    is it possible they bungled the job?
     
    #16 bisco, Jan 15, 2019
  17. MJ50

    MJ50 Junior Member

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    not sure... that's y i flushed brake fluid just in case...
     
    #17 MJ50, Jan 15, 2019
  18. JC91006

    JC91006 Senior Member

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    Check for that noise outside of the car, with the hood raised. If it's the actuator/accumulator you'll hear it.
     
    #18 JC91006, Jan 15, 2019
  19. MJ50

    MJ50 Junior Member

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    i'll need extra feet but will make video from the engine bay next time...
     
    #19 MJ50, Jan 15, 2019
  20. Sharnold

    Sharnold Active Member

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    It sounds like the brake actuator as mentioned above one sure fire way to know is with the car not running but in ready mode press the pedal till you hear it let off quickly then press harder if the noise gets louder than before more than likely you have air in the system
     
    #20 Sharnold, Jan 16, 2019
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