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pop sound when AP breaks -- normal?

Discussion in 'Model S' started by tranph, Aug 4, 2016.

  1. tranph

    tranph Member

    Joined:
    Jul 20, 2016
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    Location:
    Virginia
    Anyone suffers from popping sound coming from AP while they break? Is that normal?
     
  2. MDMGSO47

    MDMGSO47 Member

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    Apr 18, 2016
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    Location:
    Greensboro, NC USA
    I hear a popping sound occasionally (almost like a rock hitting the windowsill), but haven't associated it with AP. I will pay closer attention
     
  3. jmsurpri

    jmsurpri Member

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    Feb 5, 2016
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    Location:
    Beaverton, OR
    There is a thunk nearly every time TACC brakes at slow speeds to a stop in my car. Not sure if it's normal. I don't think I hear it at higher speeds but road noise may be masking it.
     
  4. David99

    David99 Active Member

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    Location:
    Brea, Orange County
    wow AP breaks? Or did you mean brake? :)
     
  5. jellybeans

    jellybeans Member

    Joined:
    May 9, 2016
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    Location:
    Virginia
    I hear a noise as well when AP brakes or slows down significantly. It's kind of like a declining rattling noise. The most similar noise is a roulette ball slowing down on the wheel, just before it settles.

    Only AP though. When I pump the brakes, no noise.
     
  6. jmsurpri

    jmsurpri Member

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    Beaverton, OR
    Yep, this is exactly what I hear.
     
  7. TampaRich

    TampaRich Member

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    Jul 7, 2013
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    Location:
    Tampa, FL
    I hear the same. Sounds like its coming from behind the brake pedal or behind the left front fender.
     
  8. Lex

    Lex Member

    Joined:
    Apr 23, 2015
    Messages:
    658
    Location:
    Toronto, Canada
    I believe it is the spring-loaded brake pedal rattling a bit, when your foot isn't on it and it is actuated at a certain level by AP as mentioned above. Normal in our builds it seems and predictable in my particular car.
     

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