what shade of brown? do be careful because even with temp
dyes , it can stick to your hair. leaving you with semi color darkening .
i dont think your going to go dark brown, but also consider with brown hair , when your natural blonde grows in it looks like bald patches. a friend of mine dyed her ight blonde hair to dark brown and 3 mointhes later her hair looked grayish
so she had to dye in back to blonde.
we do all need a change once in while

i went from my natural
dark brown [ think pen cruz] to a gisele like blonde, i went back to dark and now my hair is paying for for it

i wont bleach it again for a long time - way too much maintenance