Hey, my clay brush is not really precise, so i can literally not really draw anything with it or take some clay from my object because it is effecting the whole objekt an not just an area from it… even so i set the brush very small.
can anybody help? 
How dense is your mesh? Sounds like you’re working on a low poly mesh - even a small brush will affect the mesh when you hit a vertex. Try subdividing the mesh and try the brush again.
ahhhh yessss of course… that was exactly the problem !! thxxxxx so much 