I'm doing the same thing on my '83 CB450SC. I broke the screws holding the master cylinder reservoir cap on but found the reservoir (the whole perch in fact), off a 700S is the same (except the reservoir is metal, not plastic). I imagine the CB650SC reservoir would be the same as well but I'd have to check. Don't know about the calipers.
Graham
On Feb 23, 2010, at 4:13 PM, Chuck wrote:

I have a 1982 CB450SC Nighthawk that I recently purchased from a friend. It was garaged for about 5-6 years with a starter problem, and I'm in the process of getting it running again. When I removed the front brake caliper to change the pads and bleed the system, I was unable to get the caliper pistons to release. I ended up having to use a vice to get them to budge at all. I was thinking about rebuilding the caliper, but I seem to be unable to find any rebuild kits for this year. The local shop says the earliest one they see listed is for the '86 450. Is there a kit from another bike that might work for mine, or could I just reuse the old seals? The brake fluid in the bike was pretty nasty, and I'm also rebuilding the master cylinder piston as well, so I imagine the whole system could use a good cleaning.

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