Going from master to rear wheel cylinders could take a LONG time. In fact, you may not be able to gravity bleed if the system is empty except for the master cylinder. May have to encourage it with some two-person pedal-pumping before it'll gravity-bleed.
As with any bleeding, you'll let it drip until the fluid coming out
1. Has no air bubbles, and
2. Looks virgin-fresh.
You'll need a scan tool to bleed the ABS unit, unless this vehicle is old enough to have the iron-body RWAL system. If it's got the aluminum RWAL, or the newer 4-wheel ABS, you have to have a scan tool.
As with any bleeding, you'll let it drip until the fluid coming out
1. Has no air bubbles, and
2. Looks virgin-fresh.
You'll need a scan tool to bleed the ABS unit, unless this vehicle is old enough to have the iron-body RWAL system. If it's got the aluminum RWAL, or the newer 4-wheel ABS, you have to have a scan tool.