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Thanks. I am weighing my options. I've been suggested replacing calipers with SLX m7100 ones. They are dirt cheap at 219dkk a piece including brake pads. But some fancy Hope calipers sound sexy
Hulsroy-
Yeah the hope calipers come up on ebay pretty often, especially post mount shimano.
Prices seem to vary on ebay, about £100 for a pair seems common but you can get lucky and pay less.
I paid £50 for a pair of sram variants on the forum a couple weeks ago.But having said that the slx calipers are pretty cheap.
For balance I used shimano brakes on mountain bikes for about 10 years without issue but for some reason suffered lots of issues in more recent years when the designs changed.
Also worth mentioning that the rx4 calipers on my winter bike are waaay more powerful than the shimano calipers they replaced!
TotalShanner
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.