Another vote for gravity feeding the lines, and bleeding them - starting with the passenger side rear.

I you are doing this alone; you can cut 2x4 to use between the pedal and the wheel. Pump the pedal place the 2x4 in. Top off the reservoir, the bleed the wheel cylinder/caliper.

It is good to reproduce this procedure in a few days for a complete system change as you are doing.

[addsig]