I think when we talk about someone else it is not hard to choose the right word between "bring" and "take". But when we talk about ourselves it seems that it makes no difference whether we choose one or the other.
For example :
I will take three suitcases with me when I travel to Paris.
Since Mary has just moved to town, I will bring/take her with me to luncheon on Sunday.
When I opened my luggage in the hotel room, I realized I had forgotten to bring/take my new suit for the interview.
I've brought / taken my car with me.
So especially what is the right word for sentence 4 and why?