I wonder if the 1/2" tube was used so that air bubbles could move along the tube by themselves to the highest point, to be removed at the bleed point by the bulkhead. They might have had the same trouble as you guys in trying to push bubbles to the bleed on the slave cylinder. It is hard to see how this system is much different to an ordinary brake system but there is obviously some reason that they went for 1/2" unless as Malcolm suggested it is actually a mistake by the designer - seems unlikely though. The larger pipe would have made any problems due to heat worse as there would be more fluid expanding by the same % so more to accomodate.
I think I would use 5/16" tube and follow the original route and include the extra bleed point as that aught to be where air would collect by itself.
David
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