Yes;
when you push the piston back on the front calipers and the cylinders back
on the drums -
open the bleeders and block of the hoses (clamp them lightly) to avoid
pushing dirty fluid up the hoses and into the brake system. Most systems
DO NOT like dirty fluid being PUSHED backwards, and pushing caliper
pistons back often dislodges dirt - right into the ABS controllers, etc.
When pistons are back, release the clamps, and leave the bleeders open -
and the system will gavity bleed for you.
The more and cleane rthe fluid you add the better.

Failing to do this can prove to be very expensive on some systems (90's
Ford F series, GM light trucks - and most others!)

Also saves the bleeding hassle!