See you’ve sorted it now .....
I’ve rebuilt my calipers on a previous SC430, had them off down the shed and stripped out pistons etc, I use a vacuum style of system to remove all the air.
I’m taking it you clamped off the flexible hoses behind the calipers and didn’t let the master cylinder run dry ?, with 3 corners still clamped off start with furthest caliper from master cylinder . My vacuum bleeder in an engine oil draining device with a clear hose so I can see the bubble sucking through the clear pipe. (This photos is my current RAV4 bleeding the brakes )
With the device drawing the brake fluid out I just needed to stand and watch the Master cylinder empty, (not need to pump the brake pedal)... with occasional looks back at the Caliper to see if it’s just fluid come out and not bubbles, then lock nipple up , repeat the process on the other 3 corners of the car.