Dolby109

Recently I swapped Q45 brakes onto my S13...and as usual it was a fiasco.
After finally getting the brakes on everything seemed good but a few days later the brake pedal went to the floor, brake fluid was gone. Eventually I figured one of the calipers was blown.

So I order a new caliper (AdvanceAuto only had 1 R-caliper left in the country) and I get it, put it on and power bled it (side note...they sent me the right part, but it was a Left Caliper...so I had to hold it upright with the valve on top to bleed it).

So I took it out for a ride and the brakes had good feel, no squishyness and if I hit them hard both front brakes would lock up. I figured I got off lucky.
But...today I drove it to work and realized that if I am sitting at a light the pedal slowly moves down if I keep pushing on it. I checked the fluid and its ok, so I assume this means there is still air in the lines?

So how exactly do I bleed the other lines? Presumably the air in the other lines is all at the top near the master cyl. I've never really had to bleed more than one brake. Can I just open up the bleeder valve, or do I have to power bleed each one? Is there a way to reverse bleed them (push fluid through the bleeder valve)?