e-brake bravery?

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*

 

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.

 

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*

 

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*