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Aha! there was a mistake in my notes, port E is fed from one of the lines to the brake servo so it only sees pressure when the foot brake is operated. Still not sure what this line does but I do understand how the rest works.
In theory, with the hand brake applied, pushing and holding the footbrake should release the handbrake; I'm not sure why you would want this but I'll have to give it a try one day when it's all back in one piece...
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