633CSI Brake bleed

Hello and need help. Changed rear trailing arm bushes but needed to disconnect the rear brake lines, changed disk pads at the same time.
Now bleeding the system but cannot get the spongy soft peddle to go. Bled front 3 nipples each side, rear nipples and master cylinder 2 nipples but still get soft peddle. Any comments on other bleed points or correct procedure. Very frustrated. 1976 633CSI, RH drive Regards, Serco Australia
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