| Jeez Shazaam!, a couple of lines would have done! But seriously, thanks.
I think you may have hit it on the head there, it was a very hot day for Scotland (28 °C) and I was tanking on a bit. I think there must have been water in the system that boiled because there was no warning when the lever went.
I think I’ll invest in a new standard slave cylinder, new Goodridge line and a bleed nipple at the master cylinder at some point. I really appreciate the help you guy’s give out on this board because I’m running the 748 on a shoestring and do all my own maintenance. | 
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