loud steering noises

Hello V8 community,
I think the question has been dealt with here before, but unfortunately could not find anything under the search function.
I hope someone helps me anyway:

Mine is a beginning 93 ́er and now has almost exactly 150tkm down and the problem is, with very slow driving and the inserted steering wheel sound from the front very loud, strange squeaking noises in connection with the use of the brake pedal. I suppose you can hear it clearly from the outside.
It's probably going to have something to do with steering. Now I would like to know what is broken and what it costs about.

Thank you in advance and comes well through the winter