Yes, bleed them.
This is a two person job (unless you have the right equipment).
Have someone step on the brakes while you slightly open the bleeder. The point is to close the bleeder back before the fluid stops coming out. (Otherwise, air will go back in.)
Do this several times. Be sure to keep a check on the reservoir and keep it refilled.
If you haven't flushed out and replace all of your brake fluid in the last two years, then you need to keep going until you get new fluid out, and you will need to do the front wheels too.