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@branwen
I have a pair of Shimano disc brakes that haven't been used for ~4 years, and appear to have lost their bite.
Have cleaned the pads/rotors and still no luck.
No obvious fluid, so I don't think they're leaking, and there doesn't seem to be any sponge-yness so I don't think they need a bleed - the leavers don't bottom out on the bars.
My gut feeling is that they just need topping up with fluid, but I'm already at the limit of my knowledge, and don't have the kit to try.
Also, if I'm realistically only going to ride it a handful of times before next spring, is it worth just hanging it up again and getting it serviced then, rather than now and then leaving it unridden for another 6 months