Unfortunately I'm no Mac expert, but I'd suggest they're in your (hidden) user Library somewhere. Maybe Station_two or another Mac expert can offer more specifics.
Im no mac expert either =/ I guess I'll just be more careful with the way I install brushes from now on. But if anyone else knows it would be great. Thank you guys!
I did some of my own research on this, and found this useful link:
Follow these instructions to install brush sets:
1. Download or move the .ABR file to a permanent location on your computer. This could be into the Photoshop Brushes folder (full paths below) or a central location you create for Photoshop brushes. To place it in Photoshop’s existing brush folder, move or copy the .ABR file to:
Windows: C:\Program Files\Adobe\Adobe Photoshop CSx\Presets\Brushes\
Mac OSX: Applications/Adobe Photoshop CSx/Presets/Brushes/
2. Open Photoshop and select the Brush tool.
3. On the Options bar, click the down arrow beside the brush shape preview. This will open the controls for brushes.
4. From the brush control popup, click the right-facing arrow in the top right corner and select Load Brushes or Replace Brushes.
5. When the Load Brushes dialog appears, navigate to the location where you placed the .ABR file and then open that file.
6. If you chose the Replace Brushes command, Photoshop will remove any existing brushes from the Brushes palette, leaving you with only the newly loaded set. However, if you chose the Load Brushes command, Photoshop will add the new brush set to the end of the list of brushes.
7. Start brushing!
As suggested by Noel, try these folders which will be hidden by default in Lion.
~/Library/Application Support/Adobe/Adobe Photoshop CS5.1/Presets/Brushes
~/Library/Application Support/Adobe/Adobe Photoshop CS6/Presets/Brushes
"~" is shorthand for the current user's home folder.
Janelle, I think that particular set of instructions is out of date, precisely because it refers to the system level Photoshop installation areas, rather than the user areas. It has fallen out of favor for users to install things in system areas.
Unless you specifically use Finder to move an ABR file to the Applications/Photoshop/Presets/Brushes folder, only stock items will be there. When you save your own ABR files, the default location that they will want to be stored is in your user folder: Users/[Your user]/Library/Application Support/Adobe/Adobe Photoshop [Version]/Presets/Brushes, although you can save the files anywhere. If you have loaded brushes into Photoshop, they are not stored anywhere as an ABR file. Instead, they are part of your preferences.
If you are looking to back things up, you will want to save the brush sets out (Preset Manager will probably make this easiest for you) and create new ABR files (if you no longer have the ones you downloaded to install them in the first place).
OS: Windows 7
If you are using Photoshop CC 2015 the brushes are stored under:
C:\Program Files\Adobe\Adobe Photoshop CC 2015\Presets\Brushes
To make them easier to find in future I recommend creating a shortcut to them (windows: Right-click-> New-> Shortcut)
You might be better served using the hidden folder
C:\Users\your user name\AppData\Roaming\Adobe\Adobe Photoshop CC 2015\Presets\Brushes
as it works for both 32 and 64bit versions.
Thank you. That answers another question I posted separately. Much better workflow
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In Adobe CC through CC 2015 Photoshop if you would like to replace the default set of brushes with a set you spent a lot of time setting up here are the steps
1) Rename your set of brushes to "Default Brushes.abr"
2) Rename the adobe PS default brush set to anything you like I left it in the directory and called it "Default Brushes old.abr"
3) Go to the directory "C:\Program Files\Adobe\Adobe Photoshop CC 2015\Required" in there you will find the file called "Default Brushes.abr" this is the file you MUST rename to old
4) Paste your set you renamed from step 1 into the directory in step 3 then open Photoshop hit the F5 key and your custom brush set is now the default set!