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Usually tbh caused by folk putting wheel in and the rotor going behind pads and taking chips out of the ceramic material (or causes a stress fracture point)
To be fair, I think I’ve done this at least a couple times.
I have chucked the BB7s on for now.
Can’t remember if I said but I have an mt200 brake which I could take the caliper from but one is bh90 hose and the other is bh59 or whatever it is so not sure how the compatibility works on that?
M_V
coventry_eagle
All of those white ceramic piston mtb and early flat mount road calipers are susceptible to piston failure. Usually tbh caused by folk putting wheel in and the rotor going behind pads and taking chips out of the ceramic material (or causes a stress fracture point), or pushing pistons back and getting them anything but perfectly straight in with a plastic tool = chips internally. Or very old heat cycled fluid causing piston to just disintegrate internally, either into powder (that travels to lever and kills it) or the piston separates into an inner and outer piece and you can't push it back.
Seen it literally hundreds of times. Just get a newer generation caliper, latest deore is fine, not had any issues with 2019> release date calipers other than usual screwdriver rammed in thr caliper damage.
Tell tale is despite a perfectly clean caliper, after some actual braking effort pada have a circle of fluid on back of them. Or you've got a damp crack between the caliper half's