Have a look at
As for the path to the cache, it should be in a hidden folder in your home directory called .cache. I don’t have my Mint box handy, just a Solus VM, but if you open your file navigation app (Files?), there should be options in the top part of the window.
If you’re using the GUI, you probably have to change its options to show hidden files. If you go into Terminal, you can type
cd ~/.cache/BraveSoftware/Brave-Browser/Default/Cache
and hit Enter/Return, then type
ls -al | more
to list the contents a screen at a time. To get out of the ls command, just do ctrl-C. To delete the contents of the Cache folder, type
rm *.*
and hit Enter/Return.
To get out of Terminal, type
exit
and hit Enter/Return.