How to delete the function of brushes?

My updated photoshop has the brushes palette, and they have the little function icon in the right corner.  I don't want them to stay with those functions.  I want to have them just as a toolset, where I click on the function I want and then choose the brush I want to use for that function, ie. click on eraser, then click on the brush I want to erase with.  Now I have a brush I use all of the time with the eraser icon in the corner, but I cannot use it as blur or brush now.  I tried clicking on the Ctrl key when I selected it, but that didn't work. (Using an updated version of photoshop on a pc.)  How can I delete those functions that have gotten saved with the brushes?  How can I prevent those functions from attaching themselves to my brushes in the future?  (I have looked for the answer, but I must not be using the right terminology.  I clicked on Restore Default Brushes, but that didn't do anything.)

Thanks for your help,

GS