Peter,
I experienced similar problems with my 1984 manual RRC. The problem with manual bleeding etc is the long horizontal pipe section across the firewall. any air collects here and rises up the pipe down to the slave, between pumps etc.
I used an old 1l thinners can, added a wheel valve to the centre of the cap (but leave the valve out) and put a airline fitting through the bottom. Ran a clear tube from this fitting to the slave bleeder. filled can with fresh fluid, and tilted it to ensure max coverage of airline fitting, used my air compressor to pressurise the can (only enough pressure to get the fluid to move smoothly along the tube, the can may bloat a bit). open the bleed on slave, fluid builds up in master cylinder, and eventually overflows. Remember to stop if you see air in the clear line from the can!.
Michael T
2011 L322 Range Rover 4.4 TDV8 Vogue
Aussie '88 RR Tdi300 (+lpg), Auto (RIP ... now body removed after A pillar, chassis extension to 130 & fire tender tray.)
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