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for sticky piston? Bring them out by squeezing lever, you can press on one side to bring other out. Be careful they can pop out so stop once they are about 3-5mm out. Clean on their sides with cotton buds and clean mineral oil. Repeat until the cotton buds dont return with black muck. I usually pair this with a bleed.
Thanks for the brake pads advice.
On closer inspection I had very uneven wear on the old pads, possibly a stuck piston?
Bike was new in late October, can't decide if it was a set up issue or if a piston seized over Christmas when the bike was sat for a couple of weeks. I will probably just resolve myself rather than involve the shop, but thoughts would be welcome.