Blender Clay brush Help!

Hello there! I have a problem with the clay brush tool, once i go into sculpt mode and try to use the clay brush it doesnt do anything, any other brush works just fine. When I open a blend file of a friend model the clay brush works fine. Please help :frowning:

Check your brush settings, maybe it has Strength all the way down to 0 or Autosmooth cranked up. By default, Blender keeps strength setting for each brush independently, though you can enable the unified setting in the Options tab of the toolshelf. If thatโ€™s not the issue, please post the offending file on pasteall.org/blend and share a link so we could take a look.

As Stan suggested
However, clay brush is completely useless under dyntopo mode.
It is just another standard brush. Nothing to compare with the excellent zbrush clay brush.
Under multires mode, it does something. Again, it is a very weak brush. Better disable it IMO.
Clay strips on the other hand, this is a very useful brush. In dyntopo mostly.