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Steeleagle
Posted on Monday, October 04, 2010 - 09:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'm FINALLY getting around to working on my '90 RS1200 and this will probably be the start of a string of posts as I go through it and my '92. I finally got the '90 running this weekend after sorting through some wiring issues on the fly (fuel solenoids weren't wired to work!) and going through and cleaning up the carb, so my motivation to ride it is on the high-side. (The '92 will be a bit more...involved!)

The front brake master cylinder has been sitting dry for who knows how long (as received from previous owners) and I want to clean it up and make sure it works. It didn't pass fluid when I tested it. I choked when my HD dealer quoted me $43 for a rebuild kit, so my 1st request is suggestions on a cheaper route. I've disassembled it and the cylinder bore needs a good hone/cleanup job, for one. I don't THINK it's pitted at all, but I'll be checking. That would divert my course, for sure. The piston O-ring doesn't look any worse for wear, but I'll be looking at it more closely and am inclined to replace it regardless.

I'm not opposed to investing where I have to, but I'm not interested in being cheap on the parts that will protect my backside. I also don't want or need to toss money away unnecessarily. So if I need to buy a hone, rebuild kit, etc. I will. I admit that I'm mechanically fearless and fiscally irresponsible!

What have you guys done for master cylinder rebuilds? A web-check says steel wool on a spinning stick to clean, o-ring from the local hardware. OK, not QUITE that simple, but close. Advice on parts to use, methods used, sources of parts/tools?
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Ratbuell
Posted on Monday, October 04, 2010 - 11:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

$43 for the main item in your "whoa" power was easy to stomach for me. Whether the O-rings look pitted or "bad" or not...if they've been dry that long, they're probably more plastic than rubber. I know *I* wouldn't want to trust them with stopping me. I got the master cylinder rebuild kit, and the caliper rebuild kit, for my S2 when they started acting up.

That was...oh...about 11k miles ago. Less than $100 spent, and MUCH cheaper (and more painless) than bodywork.

Very cool to see more originals going on the road - definitely keep us posted.
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Rich
Posted on Tuesday, October 05, 2010 - 06:04 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Cross reference the part number at Drag Specialties, may save you a few bucks.

There are other aftermarket options, too.
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