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Good shout, I'll do that tomorrow.
@Jung It's the OEM Brembo off of an R6. 16x19 and confirmed to work with these calipers very well. Already tested it independently and it's near new and works a dream, but once attached to the system, the stroke is very long and spongy in a similar way to the previous MC.
Calipers rebuilt about 6 months ago, so I reckon that leaves the lines, which have seen better days.
Weird.
I'd get the caliper above master and then vacuum again. Give it all a good shake to promote bubbles up.
If that fails strip the caliper.