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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
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BrickMan
@M_V
Fucking hydros!
Pulled my mtb out to chuck it in the car and go ride before work today and the front SLX brake was making the kinda howl that'll have you looking longingly at a bb7.
About ten days ago I faced the mount, cleaned up the caliper, lubed the pistons etc and then did a decent ride a day or two later during which I did ride through several many rivers and a rotting sheep carcass but it seemed absolutely fine. Must have done something though as the back of one of the pads was damp and there was a spot on the rim that could have been a drip of oil.
I have a spare mt200 rear brake so might chuck the caliper from that on, should be compatible right?