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They are on a 2016 synapse, the store I took it too had a couple of other bikes in with the same problem and they knew right away like it was something they come across a fair few times. @hippy Also really surprised there wasn't a recall or a letter sent out warning folk, my mate wiped out pretty hard.
There's some with broken pistons:
http://www.bikeradar.com/road/news/article/shimano-r785-road-hydraulic-disc-caliper-failure-45088/