i ran out of brake fluid in my rear brake reservoir and of course my rear brake quit working. i filled it back up and it still doesnt work. if i run it completely empty do i have to bleed the line to get them working again? how do i do it? just loosen the line that goes into the brake, let it drain for a second and tighten it back up?

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2001 400EX

fill fluid open bleeder let it sit open for a while until you see fluid only coming out .then you need to pump pedal up and hold it while holding pedal loosen bleeder. when no more comes out tighten bleeder. keep doing that until you see fluid only coming out no air and pedal feels good.---dont let fluid get low in the process