Grunge brushes Photoshop

doing the tutorial on this site and others. The brushes that ive made are pretty faded in colour. To faint to see really. how can i fix this?

bump the levels? increase contrast…?

You can take the layer of the grunge brush you made and duplicate the layer. You’ll see the color information duplicate.

Should work. Afterwards, you can use the contrast and curves to apply other effects if needed ;).