Rear master cylinder source?
- icouldabeenav8
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- Location: Chatsworth, California, USA
Rear master cylinder source?
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?
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.
Once again i think it was Nils that looking into getting the cylinders bored.
- FalldownPhil
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Re: Rear master cylinder source?
I believe you are correct Steve.
Best,
Phil
Best,
Phil
When you are up to your ass in alligators it is sometimes difficult
to remember that your objective was to drain the swamp !!
to remember that your objective was to drain the swamp !!
- icouldabeenav8
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Re: Rear master cylinder source?
Thanks, buying a cheapo ebay master cylinder - will report back.
- icouldabeenav8
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Re: Rear master cylinder source?
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.
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.
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Re: Rear master cylinder source?
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?
Rebuild kits for the original M/C s are still available from Honda.
Dave
Dave
- icouldabeenav8
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Re: Rear master cylinder source?
Still holding.
- CopperCollar
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Re: Rear master cylinder source?
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?
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?
When given the choice between being right or being kind; choose kindness. W. Dyer
- NobleHops
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Re: Rear master cylinder source?
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.
Nils Menten
Tucson, Arizona, USA
'82 CBX, among others.
Tucson, Arizona, USA
'82 CBX, among others.
- icouldabeenav8
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Re: Rear master cylinder source?
Still holding. Success declared.
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Re: Rear master cylinder source?
I had the same problem and bought a new rear master cylinder from Aliexpress for £10. All I had to do was drill the master cylinder top mounting hole to 8mm and tap the bottom one to 8mm. Works a treat.
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Re: Rear master cylinder source?
I came across this information in the 2018 March/April issue of Motorcycle Classics magazine.
Brake and Equipment Warehouse (brakeandequipment.com) in Minneapolis Minnesota will bore out your pitted front or rear master cylinder
and press in a stainless sleeve and hone the inner diameter to OEM dimensions.
Brake and Equipment Warehouse (brakeandequipment.com) in Minneapolis Minnesota will bore out your pitted front or rear master cylinder
and press in a stainless sleeve and hone the inner diameter to OEM dimensions.