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The manual says that if you hold the electronic handbrake for a prolonged period when moving it will perform an emergency stop, braking all four wheels.

Anyone tried it? Wondering how fierce it is?

Maybe need to find an empty road

I tried it once .... but the accompanying DIS beep put me off so I released it quite quicky and haven't bothered doing it again.

Seeing that in the manual has the same effect as saying "don't ever touch this button".

You know you will

One to try on the courtesy car come service time rather than your own car haha

Shouldn't be any different as using foot brake?
Doesn't it use the normal brak calipers?

Not quite the same but my old jag had it and that was the same , when I tried it the car slowed gradually and not in the neck snapping fvck me stylee you would expect / want

That's what is expect esp as you don't have any analogue control on the brake - either on or off so it would have to be pretty moderate at best

Indeed , you really have to pull and hold it hard ( more tea vicar )

This is the kinda thing that one should try somewhere like Millbrook Proving Grounds

I've not got past hearing the warning beep, which was my one time only required warning that the switch I am fiddling with is not the window button (habit from past BMWs).

If it applies full braking force, I imagine it is pretty severe.