Yes and if you would have seen that i wrote " Brushes " witch indicated more or less that it is some kind of version of that and thats how he explained it to me, a metal piece landed between some parts that should not touch each other and caused a short circuit in the rear engine. If you didn't like that explanation well i am sorry to hear that but thats how it was explained to me, so go tell that to the I technician at my service department who explained it in that way.
But that sucked and when that happend to my car that was the 2nd car in the world with this issue reported but there is probably many more with the same date that mine was made that has or will have this issue therefore no recall was made.
I read what you wrote, and I am sorry you had bad luck with your car. That, or similar problems can happen to any car, not just BMW, and not just the i4.
As I said, I did read your post, and you actually said:
"In the electric engine, there is this type of "Brushes" the same type of idea that you will find in a battery driven screwdriver"
...and that is why I wrote what I wrote. You compared the i4 motor with a cordless drill motor, which is nonsense. The technology is NOT the same at all. The cordless drill uses simple commutators with gaps between the rings, generating sparks and dust and wearing out fast. That's NOT the way the BMW motors work, they use slip rings without gaps in the rings, and as a result, there will be very little dust, no sparks and considerably less wear, which is why BMW dare using such short brushes. Also the service, in case needed, is really simple and fast. Of course, there are gaps BETWEEN the rings but not across, like in a cheap simple DC motor you compared it with.
This what the slip ring motor looks like in the car, in case you haven't seen it before. Schleifringmodule = Slip ring modul and you can clearly see the three brushes, how short they are and how easy it is to change, thogh I don't expect the need of chage during the lifetime of the car, or at least not for a very long time. Of course, if a metal piece somehow ends up in module, that will (may) short circuit the motor coils, but to be honest, that would cause a stop in ANY type of motor, because no motor would continue running with a lose metal piece in it, at least not for a very long time and definitely not at high speed.
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As I said, I am sorry for your trouble, but it's good that your car was the second in the world with that problem, confirming that there are no serious problems with the technology or the quality of work. Of course, statistics is one thing, but your car is the only one of a million, that is no comfort for you at all, which I perfectly understand, since I have a similar experience with another brand, a Mazda 6 I had before the current 330e. It broke down on the motorway in Slovakia, on my way to Hungary on it's premiere tour, after only about 900 km. The problem was the gearbox, the car got towed to Mazda, and they kept it. I can't even speak the language there and they couldn't speak any other language, so I had to take all discussion through the Swedish Mazda rep who called someone in Slovakia and so on... Anyway, the gear box was brand new for Mazda, there was not a single spare in Europe and it took 3 months to get one from Japan. The car got transported back to Sweden during that time, and then finally fixed here. I was globally the only one with that failure according to Mazda. True or not, I have no way to check it, but it is also of no importance, since I wished it was someone else's car, not mine. Pure bad luck, nothing else. After that, I drove the car three more years without any issues before trading in. My case was worst than yours, since I could not carry on driving with the car at all. You could drive slowly, which is for me surprising if there really was a short circuit, but in any case, it doesn't matter, your case is also horrible seen from your perspective.
