loud squeaking

Hi, everybody, for some time now I’ve noticed a quite loud noise when I’m starting. Now I’ve tried a little bit about when exactly it’s happening. As soon as the car rolls in slow motion, it squeaks somewhere, almost as if a train slows down. At the very slow start and when rolling out, just stop there. I don’t kick the brake. As soon as I try to slow down carefully to see if something changes, I’m already standing still, because almost no speed. There’s no change in the sound. A little bit faster, and the sound is gone. Does anyone have an idea what I can look at? Thank you very much Mario