I made my own brushes i use for lineart and colouring but whenever i turn off the computer, the brushes get deleted or they disappear. This has happened to me multiple times and I really don't want to create the same brushes over and over again. I saved the brush presets and all, i also named them, They do appear in the brush presets but whenever i quit photoshop, it disappears.
After defining a few brush presets, go Edit > Presets > Preset Manager.
Select Brushes from the dropdown at the top.
Select your new brushes, (they will have a blue outline) and Save Set
Where do you put your brushes?
What operating system are you using?
What version of Photoshop?
This tells you the file locations.
If you are using Windows, the App Data path is probably best, but you need to make hidden files viewable from File Explorer
C:\Users\Your User Name\AppData\Roaming\Adobe\Adobe Photoshop CC 2017\Presets\Brushes