TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker and becoming a Supporting Member. For more info: Support TMC

Brake Hold question

Discussion in 'Model 3' started by RedModel3, Dec 31, 2019.

  1. RedModel3

    RedModel3 Member

    Feb 19, 2016
    United States
    I've searched and cannot find an answer to this specific question.

    When Hold is engaged, will it stop the car from moving forward if hit from behind? In the old days of drivers' ed. classes, we were always taught to keep our foot on the brake pedal when stopped in traffic, just in case some bozo hits us from behind, in order not to roll forward and hit the car in front of us. Is this something that the brake Hold mode will do, or will it release if hit from behind?

    Just wondering - not that it's happened.
    • Like x 1
  2. holmgang

    holmgang Active Member

    Sep 9, 2019
    I dont think that old advice holds.

    If you are sitting on the brakes, being hit from behind would knock the car forward and your foot off the brake anyway (unless, you were really really holding onto it intently, all of the time).

    The entire concern might not be so germane anyway, since that car behind would likely hold all responsibility, and (unfortunately) your car would bear the brunt of the impact regardless if braked or loose.

    Safer thing to do, is to provide a bit more space in front.
  3. ecarfan

    ecarfan Well-Known Member

    Sep 21, 2013
    San Mateo, CA
    That will depend on the force of the impact. Hit hard enough by a heavy enough vehicle and your car will move.

    If you are worried that even a soft impact will somehow cause the brakes to disengage when in Hold mode, I think that is unlikely.
    • Like x 1
  4. CharleyBC

    CharleyBC Active Member

    Jun 28, 2019
    Talent, OR
    I agree. The car should not release the hold until you tell it to. You should not just freely roll forward, though if you’re whacked hard enough, you’re going to move, regardless whether it’s the hold feature or your foot applying the brakes.

    I have no intention of testing my theory.
    • Like x 1

Share This Page

  • About Us

    Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.
  • Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.