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Shimano don't sell the pistons or seals as spares. If you get a leak or damaged piston within the warranty period you'll get a new one assuming you're original owner.
But otherwise you're shit out of luck and have to buy a whole new caliper.
This is why I stopped using Shimano hydro brakes on my mountain and road bikes. Sram calipers are rebuildable with piston/seal kits.
A good option is buying Hope RX4 calipers that are compatible with Shimano levers. The RX4 calipers are at least rebuildable. The hope calipers are a tad pricey but forking out for new shimano calipers more than once would cost more in the long run.
TotalShanner
Hulsroy
Doing some maintenance on faulty Shimano RS-785 calipers.
Piston is crushed on the inside.
Is it worth buying new pistons and seals? If so anyone know the parts numbers? I've struggled finding a manual.
Or should I just by a new caliper and save this for spares?
...I sort of know the answer already.