e-brake bravery?

Discussion in 'Hyundai Kona Electric' started by hobbit, Oct 3, 2019.

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  1. hobbit

    hobbit Well-Known Member

    I found an old thread or two implying that rather drastic things happen
    if the e-brake gets pulled at speed. Has anyone done that, hopefully
    under controlled conditions that wouldn't endanger life and property?
    Is there any sanity-check like with going into P or R? I could easily
    see a naive or careless passenger doing that when the driver doesn't
    expect the car to suddenly be dragging its butt.

    I'm not about to try that until there's snow on the ground or I find a
    patch of really loose gravel ... but if this is a real (mis)operational
    hazard, I would seriously consider adding a separate enable switch
    located well out of harm's way to prevent it.

    Stupid design, hands-down.

    _H*
     
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  3. Never tried that, not that brave, but do let us know;)
    Before I paid for the car I did try the park and reverse buttons at about 50 km/h and got an error message only on both (improper shift condition or something like that)
     
  4. Francois

    Francois Active Member

    Imagine yourself driving on the highway and accidentally pressing the reverse mode??? You'd get ejected through the windshield or strangled to death by the seat belt. :)

    I am sure they must have a fail-safe in place to so that Reverse or Park cannot be engaged while the car is moving forward. It'd be crazy to be at mercy of something/someone (a cat? a child?) hitting those buttons while you are driving.

    I'll be putting a box on top of those buttons if I ever hear that they can be engaged while driving forward.
     
    Wildeyed likes this.
  5. Relax. My dog plays those buttons like she's Liberace on a baby grand. It won't happen.
     
    Kitsilano, Esprit1st and Francois like this.
  6. Francois

    Francois Active Member

    Your dog is a great QA tester. :)
     
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  8. I remember reading something in the manual about the e-brake. You can pull it while driving and it will slow down the car to a stop. However it has to be constantly pulled. As far as I understand it will be controllable.

    I'm not able to pull out the manual right now, so just recalling from memory.

    Sent from my moto x4 using Tapatalk
     
    electriceddy likes this.
  9. I am a little fearful of trying it without consoling with the Hyundai techs and actually reading it in the manual first .
    But if it is OK, I will add it to the list when the snow hits the ground and no one is around me. Could be fun:)

    Edit : read the manual, three times it mentions not to use the EPB while vehicle is moving as it may cause damage, but a little blurb on page 5-35 says
    " If there is a problem with the brake pedal while driving, emergency braking is possible by pulling up and holding the EPB switch. Braking is possible only while you are holding the EPB switch. However, braking distance will be longer than normal"
    Good memory Esprit1st;)
     
    Last edited: Oct 3, 2019
    Esprit1st likes this.
  10. Mywifeskona

    Mywifeskona New Member

    Actually, this is one of the first things I tried shortly after bringing the car home. The location of the buttons really caught my attention, and curiosity got the better of me. I tried the park and reverse buttons at speed and got some warning on the screen. I don't remember the message (it was almost 5000 miles ago) but nothing happened.

    For some reason I never considered trying the ebrake though. In fact, never even thought about it till reading it here.
     
    electriceddy likes this.
  11. OK, here is the excerpt from the manual:
    epb-manual.jpg
     
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  13. Mywifeskona

    Mywifeskona New Member

    Thanks ESP, was going to look it up later. Saved me the trouble.
    I'll skip that test.
     
    Esprit1st likes this.
  14. These are electronic controls. I can't believe that the designers would be stupid enough to build these things without some kind of safety function embedded in the system.
     
  15. Mywifeskona

    Mywifeskona New Member

    Exactly, that's why I went ahead and gave it a try.
    I've got to admit though, I did experience a bit of anxiety at the moment of truth .
     
  16. hobbit

    hobbit Well-Known Member

    As I posted the question I was also on Techinfo looking for more
    data. I did find a couple of seemingly relevant items under the
    EPB description of operation, below.

    I'll still wait to get onto a more yielding surface before messing
    with it, I think. Especially to determine how to get *out* of any such
    slowing situation on the fly without having to completely stop.

    Who knows, parking-lot donuts might be doable after all..

    _H*

    =====

    5. Electric Controlled Deceleration (ECD)

    When EPB switch is pulled in dynamic condition, deceleration is realized
    by sending request via CAN to the ESC.

    ECD means deceleration will be done via the ESC system, not by EPB Actuator;
    Applied to the vehicle with ESC only.

    6. Rear Wheel Unlocker (RWU)

    This function is for vehicle with no ESC or failed ESC. When EPB switch
    is pulled in dynamic condition, dynamic deceleration is generated by EPB
    actuator.

    Clamp force will be controlled to avoid locking of the rear wheels and
    ensure vehicle stability.

    7. Auto Apply

    With switching off ignition, EPB will automatically apply the brakes.

    Auto Apply is disabled when Auto Hold switch is switch off.

    The auto engage feature does not activate if the power switch is turned
    off while the EPB switch is pressed.
     
  17. hobbit

    hobbit Well-Known Member

    Well, I have one more piece of data. Arriving at a trailhead for a
    bit of a hike, there was a gravel parking lot with a slight slope and
    nobody in it. So just for yucks, I tried stopping "bandit style".

    What happens when the switch is pulled at any appreciable
    speed [>2 mph?] is a very urgent BEEPBEEPBEEPBEEPBEEP
    from the dash, and the rear brakes get applied to a level to
    effect a fairly aggressive stop but not to totally lock up the
    back end. The key thing is that it *releases* the moment
    you let go of the switch -- it doesn't need to be pushed down.

    So the dynamics are *sort of* like "yanking the e-brake*, but
    a lot less linear as far as control. It's probably still good for
    that quick pulse to break the back end loose in a snowy
    parking lot. Experimenting with whether disabling the
    traction/stability control affects any of this will probably
    still wait for real slippery conditions.

    _H*
     
  18. You now receive the "E-Brake Award of Fortitude" :)
     
  19. Here's question, does the e-brake button work the same whether you push or pull it? I always pull it, I guess from the hand brake habit.
     
  20. Thanks, Hobbit! That's better behaviour than I anticipated! Now I just need to line up some snow tires.
     
  21. Francois

    Francois Active Member

    You pull to activate it and you push to remove it. You can tell by looking at the e-break icon on your dashboard.
     
  22. hobbit

    hobbit Well-Known Member

    At a standstill, yes. When you're moving, simply letting go of
    the switch releases the braking and returns to normal. I didn't
    actually try pushing down, I suspect it would be a no-op in
    that scenario.

    _H*
     
  23. You can only remove it/push with your foot on the brake.

    Sent from my moto x4 using Tapatalk
     

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