Don't just measure hex size as I think the M10 ones have an M8 hex too, just to confuse things. Take it out and measure the thread width. If like my S4 the rear brake nipple is on top of the caliper, if you're careful you can do this without having to re-bleed it, you don't even need to take it out completely.
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Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers!
S4 Fogarty, S4R 07T, 748, Series 1 Mirage
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