Rear master cylinder source?

Rear master cylinder source?

Postby icouldabeenav8 » Tue May 16, 2017 4:59 pm

My '79 rear master cylinder still oozes despite rebuild attempts. Is there a source for new ones? I notice cheap Chinese ones available for other models but not for 1979.
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Re: Rear master cylinder source?

Postby steve murdoch icoa #5322 » Wed May 17, 2017 11:20 am

I was surprised to see different numbers when i looked at a parts fiche but the other years will work on your '79.
Once again i think it was Nils that looking into getting the cylinders bored.
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Re: Rear master cylinder source?

Postby FalldownPhil » Wed May 17, 2017 5:34 pm

I believe you are correct Steve.
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Re: Rear master cylinder source?

Postby icouldabeenav8 » Thu May 18, 2017 4:26 pm

Thanks, buying a cheapo ebay master cylinder - will report back.
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Re: Rear master cylinder source?

Postby icouldabeenav8 » Fri Jul 07, 2017 4:44 pm

Well, my cheapo eBay master cylinder experiment is at an end. Theoretically it would work, but after solving one fitment issue after another I decided the work was too much effort. I took another look at my old m/c to see if I could determine why it was leaking before making the final dive into modifying the new one.

Upon disassembly, I found nothing wrong with the new rubber parts. There was nothing wrong with the cylinder bore. Hm-m-m-m. I looked at my near 40-year old original rubber parts I had removed. The old stuff had no cuts, tears, rips etc., so I decided to reinstall my original OEM rubber parts.

After 24-hours , no leaks and the master cylinder is working perfectly! It may yet leak, but at this point, the m/c is vastly better than it was with the new guts. I am sure that Zeus is laughing just waiting for me to relax. :handgestures-fingerscrossed: :handgestures-fingerscrossed: :handgestures-fingerscrossed: :handgestures-fingerscrossed: :handgestures-fingerscrossed:
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Re: Rear master cylinder source?

Postby Mouse » Sat Jul 08, 2017 10:59 am

The new rubber parts are theoretically identical to the old rubber parts but in reality they are a few thousandths smaller hence they leak. Happens all the time for me with repairing my older pickup truck. I solved the frustration by upgrading everything I repair. :-)
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Re: Rear master cylinder source?

Postby daves79x » Mon Jul 10, 2017 8:34 am

Rebuild kits for the original M/C s are still available from Honda.

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Re: Rear master cylinder source?

Postby icouldabeenav8 » Wed Jul 26, 2017 4:39 pm

Still holding.
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Re: Rear master cylinder source?

Postby CopperCollar » Fri Jul 28, 2017 8:17 pm

A long shot here but in the past I was able to use the rear master cylinder off a Honda dirt bike. Close as I could tell it was the same as the CBX one but the actuation shaft was different. I was able to use the CBX actuation shaft and the master cylinder was a direct bolt on.

It's been a long time and I no longer have the part number but I think it was to one of the dual purpose bikes.

I am thinking the master cylinder may be the same across the product line with only the actuator rod dictating the part number difference?
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Re: Rear master cylinder source?

Postby NobleHops » Sat Aug 05, 2017 2:12 pm

Re this resleeving topic, I did have my front MC re-sleeved several years ago by a place called Apple Hydraulics in New York. It worked perfectly, and has ever since, was $100 or so as I recall. They were exceedingly careless with it though, nicks and gouges were all over it when I got it back. Would not use them again.
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Re: Rear master cylinder source?

Postby icouldabeenav8 » Sat Dec 30, 2017 6:44 pm

Still holding. Success declared.
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