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Not sure about the ST2 but on some bikes there is a little spacer between the lever and the piston on the reservoir. Yours might have fallen out if the levers have been changed. If you are actively pumping the lever then thats a different thing and is either air, or the pistons in the calipers have gone sticky ( they can actually move, but sort of suck themselves back into the cylinders), if that's the case you need to give them a full overhaul with new seals etc.
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