Model 3

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Sounds in driver side foot well during autopilot braking

Just checking if people generally here clicking/light knocking sound when autopilot is braking in start-stop traffic? My assumption has been that it is some kind of solenoid that is activating when it actually needs to apply the brake. It's not super loud -- moderate stereo volume would mask most/all of the sound.

Comments

  • edited December 2018
    it's the brake pedal
  • edited December 2018
    Yep. Hear it, only on AP in stop n go. Don’t think it’s the brake pedal since auto pilot does not use the friction braking system, but the motor regen braking. I think it’s just the normal sound for this.
  • edited December 2018
    Autopilot uses regen and the friction brakes when necessary.
  • edited December 2018
    Really? It uses the friction brakes? Interesting. How does it determine when to use the friction braking? Speed?
  • edited December 2018
    I noticed the same thing and almost made a thread about it as well. The thing is, I don't hear that noise when I'm driving.

    By the way, I usually hear it at about 6 or 5 mph, and sometimes at 2 mph for shorter distances during stop and go traffic.
  • edited November -1
    It uses friction brakes when it has to slow more quickly than regen allows, and to come to a full stop when necessary. It’s pretty smart. And there are times when regen is limited by a full or cold battery.
  • edited December 2018
    @Bighorn and @CharleyBC, thank you! Very cool, makes sense it engages friction to make the complete stop in EAP. More reason to love the marvel we drive.
  • edited December 2018
    @CharleyBC But why don't we hear it when we're pressing on the break?
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