Do they brakes make a weird noise that some reviewers (like Carwow) describe?The iX3 that I tested had auto hold when driven in "B" mode (one pedal driving). In my book it worked very well even at higher speeds on the Autobahn. I do not recall any jerkiness when starting from a standstill, in town of course
Most of the time I used the normal "D" mode with adaptive recuperation where the car decides how much to slow down when the accelerator is lifted based on camera and map information. It worked surprisingly well and I am normally no fan of any undue smartness in my car. I also tested the normal recuperation which felt quite right, i.e. like a petrol car. I can't say if there was auto hold in these mode, perhaps I forgot to check.
My Kona EV , has Adaptive Cruise and will stop and go into Auto hold.I checked how it works in the 3 Series.
When releasing the gas pedal and transmission in D the car won't come to a stop.
With transmission in N the car will stop. I did this on a flat surface and was not sure the brakes were on. In order to select D again I had to push the brake pedal first. That activated the auto hold I guess, because it was definitely on when accelerating.
Last test I did was on a slope (hard to find in the Netherlands). I rolled onto the slope in N until the car stopped. And then it rolled back down the slope again. No auto hold active what so ever.
So auto hold will not be activated until the brake pedal is used.
Not sure of course if it will work the same way in the i4.