Replacing shimano RS785 caliper
Having a bit of a nightmare with my front shimano BR-RS785 caliper. Bike is about 18 months old and problem started a couple of months ago. Front braking results in squealing and braking power is non existent. Tried everything - cleaning with meths, replacing pads, bled dismantled and replaced fluid transfer port o-ring - all good for a few days, bike stops on a sixpence, but a few days later same problem returns. So I reckon the the piston seals must be leaking oil which means a new caliper. Apparently a fairly common problem with Shimano hydraulics and something I've never seen with the Avid hydraulics on my MTBs. To make things worse, the RS785 caliper seems to be a bit hard to come by at the moment. Fitting is post mount with threaded hose attachment. Do I have any other off the shelf replacement options?