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M_V
@dumps
I have a pair of Shimano RS785s. At some point I hit a pothole while braking and blew something in the front caliper, spewing mineral oil all over the place. A reputable bike shop told me the calipers were missing O-rings, that some of them came out of the factory like that, and (I thought) did the job of replacing them. Problem solved.
I then realised at some point that my rear pads were contaminated, so cleaned rotors, replaced pads and marvelled at the improved braking performance. At the time I didn't connect the two things.
After months of improved braking performance, I turned the bike upside down for some routine maintenance and, what do you know, next time out, rear pads squealing (front totally fine), no braking power at the rear, back to square one.
Did said reputable bike shop only do half the job? I had thought not until now as I don't think I'm leaking fluid.
Should I
a) Clean rotors, replace pads again, never turn bike upside down
b) Source and fit said O-rings (any guidance on where to source and how to fit much appreciated)
c) bleed and replace oil (first time for this)
d) all of the above