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I've cleaned my caliper and the brake has been re-installed on the bike. The trick to removing the junk in the earlier picture was to soak the caliper in brake fluid all week. The soak turned the hard deposits spongy and I was able to pick and scrape them off with a dental tool. I also wadded up some steel wool and ran that through the seal grooves, and did the same with a bit of paper towel.
I followed all that up with a final soak in clean brake fluid and re-assembled. From the picture below, you can see that there is significant pitting in the o-ring groove. I assume it is either a result of corrosion or maybe some over-zealous cleaning by a previous mechanic. Hopefully it's not so bad as to render the caliper useless. So far the brake is working well but I'll keep an eye on it for any leaking brake fluid or other problems.
Oh, and the caliper did not turn green. That's the result of an amateur photographer.
I followed all that up with a final soak in clean brake fluid and re-assembled. From the picture below, you can see that there is significant pitting in the o-ring groove. I assume it is either a result of corrosion or maybe some over-zealous cleaning by a previous mechanic. Hopefully it's not so bad as to render the caliper useless. So far the brake is working well but I'll keep an eye on it for any leaking brake fluid or other problems.
Oh, and the caliper did not turn green. That's the result of an amateur photographer.
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