Hello, i have a very noob question…
I want to assin my most recent used brushes at the bottom of the zbrush interface like in this picture.
Can anyone help me please.
And another question would be: Is it possible to switch via a hotkey between the last used brush. example i use standard brush, press y, switch to clay tubes, press y again switch back to standard brush.
Always between the currently used and the last selected.
I hope i could make myself clear…Would be great to get some help 
As to your first question, click here.
As to your second question, you can use Shift key and assign a secondary brush to it. Normally Shift key enables Smooth brush, but while holding down Shift key, you can select any other brush to use so the next time you press Shift key, it will switch to that brush and when you let go of Shift, it will switch back to your other brush.
First of all Thanks. But i am bot yet satisfied…
I Want to keep the smooth hotkey via the Shift toggle. And assign another hotkey which toggles between the current and the last used brush.
Is something like that possible?
I think I heard of someone making a plugin that allowed for a brush toggle. That was a long time ago though, and I could be wrong.
That would be the only way to do it, if you want to keep shift as your smooth brush.