Searching for an 0-ring substitute for rear master brake reservoir
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- dbtroudy
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Searching for an 0-ring substitute for rear master brake reservoir
I’m rebuilding the rear master brake cylinder from a ‘76 GL1000 LTD. I disassembled the brake body and separated the reservoir take and internal o-ring. Cleaned the o-ring at the reservoir 0-ring in Simple green and left it out on the workbench overnight. This morning I tried dry fitting the brake body, o-ring and reservoir cup together. I could not get the cup to slip past the 0-ring. After taking another look at the o=ring, someone previously has changed the o-ring out and used flat seal. I remember before I started, the tank reservoir was sitting up about 2 mm above the brake body.
I was planning to use a new o-ring anyway in the rebuild and went and checked to see if Honda still stocks the reservoir tank o-ring, PN 45516-371-003. I discovered that this part number has been discontinued by Honda The size of the o-ring (according to Honda) is 43.75X2.5mm. Does anyone know of a substitute PN for this o-ring? And is their a vendor that still stocks this size o-ring?
Don
I was planning to use a new o-ring anyway in the rebuild and went and checked to see if Honda still stocks the reservoir tank o-ring, PN 45516-371-003. I discovered that this part number has been discontinued by Honda The size of the o-ring (according to Honda) is 43.75X2.5mm. Does anyone know of a substitute PN for this o-ring? And is their a vendor that still stocks this size o-ring?
Don
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DBTroudy
Fullerton, CA
'03 GW GL1800 Yellow
'76 GW GL1000 LTD #859
'75 CB200T
Fullerton, CA
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'76 GW GL1000 LTD #859
'75 CB200T
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Re: Searching for an 0-ring substitute for rear master brake reservoir
I believe that simple green is a mineral oil based solvent which is very bad for brake fluid components, just ruins them as you’ve found out. If it were me, I would buy a new rebuild kit and thoroughly clean all the components with alcohol or brake cleaner.
The reason being that the residue from the simple green probably has started acting on the installed rubber components already and will ruin the new ones as well if not cleaned well. You cannot expose any brake fluid component to anything mineral oil based, it will ruin the brake fluid rubber stuff, it only takes a trace amount. So if you cleaned the M/C parts with simple green, then all the rubber needs replacing, after cleaning with a brake cleaner. Sorry Don.
The reason being that the residue from the simple green probably has started acting on the installed rubber components already and will ruin the new ones as well if not cleaned well. You cannot expose any brake fluid component to anything mineral oil based, it will ruin the brake fluid rubber stuff, it only takes a trace amount. So if you cleaned the M/C parts with simple green, then all the rubber needs replacing, after cleaning with a brake cleaner. Sorry Don.
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1976 LTD restored
1980 CBX , in the que, to fix the ignorant heavy handed owner
1981 CBX
1977 CB750 K7
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1980 GL1100
1984 GL1200 naked
1969 CL350, in the que
1976 LTD restored
1980 CBX , in the que, to fix the ignorant heavy handed owner
1981 CBX
1977 CB750 K7
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1980 GL1100
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Re: Searching for an 0-ring substitute for rear master brake reservoir
Last I knew replacement cup kits had the ORing with them.
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"The book is wrong, this whole Conclusion is Fallacious" River Tam
"Yea I do dance awkwardly, and I am having more fun than you" Taylor Swift
2008 GL1800 IIIA "TH3DOG"
1984 GL1200 Standard
1975/6/7/8/9 Arthur Fulmer Dressed Road bike
1975 Naked Noisy and Nasty in town bike
Psst. oh and by the way CHANGE YOUR BELTS!!!!
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Re: Searching for an 0-ring substitute for rear master brake reservoir
You can find a 'kit' to rebuild that here....
https://newmotorcycleparts.net/brake_pa ... _kits.html
about 1/4 to 1/3 down the page
https://newmotorcycleparts.net/brake_pa ... _kits.html
about 1/4 to 1/3 down the page
- dbtroudy
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Re: Searching for an 0-ring substitute for rear master brake reservoir
I was just hoping to find the 0-ring and not use a full rebuild kit. Someone in the past substituted a flat washer o-ring instead of the round 0-ring that was supposed to be used. While we are talking rebuild kits, here is an other source I have used to re-build the front master brake cylinder on a ‘79 GL1000. The picture is of the reservoir rebuild kit for the rear master cylinder.
Don
Don
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DBTroudy
Fullerton, CA
'03 GW GL1800 Yellow
'76 GW GL1000 LTD #859
'75 CB200T
Fullerton, CA
'03 GW GL1800 Yellow
'76 GW GL1000 LTD #859
'75 CB200T
- pidjones
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Re: Searching for an 0-ring substitute for rear master brake reservoir
I buy o-ring stock on eBay, cut to length on 45 degree and glue with super glue to make my own. Been doing it a long time for large hard-to-find o-rings. Lubricate with silicone vacuum grease to ease installation (the reservoirs are tight).
"Love 'em all.... let God sort 'em out!"
Ex 2006 GL1800 - the Black Pearl SOLD! to make room for:
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1975 Red GL1000 project - ex Pistol Pete project
1972 Triumph T150V Trident rescue - finished and FOR SALE!
1976 Yamaha RD400c
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Ex 1978 GL1000
Ex 1979 GL1000
Ex '79 CB750F rat bike
Ex '86 SEi
Ex '77 GL1000
Ex '76 RD400
Ex '72 Penton 125 set up for flat track
Ex '73 RD250
Ex '68 TR6C - chopped
Ex 2006 GL1800 - the Black Pearl SOLD! to make room for:
2021 Can-Am Spyder RT Limited Dark Chalk Metallic
1975 Red GL1000 project - ex Pistol Pete project
1972 Triumph T150V Trident rescue - finished and FOR SALE!
1976 Yamaha RD400c
1978 GL1000 with '75 engine - the Hunley
Ex 1978 GL1000
Ex 1979 GL1000
Ex '79 CB750F rat bike
Ex '86 SEi
Ex '77 GL1000
Ex '76 RD400
Ex '72 Penton 125 set up for flat track
Ex '73 RD250
Ex '68 TR6C - chopped
- flyin900
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Re: Searching for an 0-ring substitute for rear master brake reservoir
Any 44 X 2.5 mm O ring will work from various online O ring suppliers. Just confirm you specs as I think Honda uses OD as their 44mm sizing spec, so measure your current O ring OD.
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1966 CL77 - Honda 305cc - Dual purpose - "Gentleman's Scrambler" was a period moniker.
1967 CL175K0 - Low production number with #802 engine serial- winter 2019/2020 full restoration.
1972 CB350F - Baby Four with low mileage - Cosmetic refresh to the next level 2021/2022.
1978 CB550K - Very original bike with only 7499 Km. from new - light cleanup and refresh done.
1983 CB1100F - Canadian model - DOHC Supersport in pristine low kilometre condition from new.
1984 GL1200 - Standard model in showroom condition - two owner bike from new.
1984 CX650E - Restored summer 2017 - a rare Eurosport model - excellent one owner bike.
- dbtroudy
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Re: Searching for an 0-ring substitute for rear master brake reservoir
This is an interesting idea of custom making an 0-ring. How well does the super glue hold up?I buy o-ring stock on eBay, cut to length on 45 degree and glue with super glue to make my own. Been doing it a long time for large hard-to-find o-rings. Lubricate with silicone vacuum grease to ease installation (the reservoirs are tight).
DBTroudy
Fullerton, CA
'03 GW GL1800 Yellow
'76 GW GL1000 LTD #859
'75 CB200T
Fullerton, CA
'03 GW GL1800 Yellow
'76 GW GL1000 LTD #859
'75 CB200T
- Sagebrush
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Re: Searching for an 0-ring substitute for rear master brake reservoir
Go to a local John Deere dealer if you have one. They stock gobs of O-rings. Tell them what you need and see if they can match it. They are likely to find something very very close.
Dean Spalding
Raleigh, NC
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Raleigh, NC
"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe." - Albert Einstein
'82 Yellow GL1100
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My Gallery
My 1100 Build Thread
- dbtroudy
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Re: Searching for an 0-ring substitute for rear master brake reservoir
I wish - I live in Southern California - no one here drives a tractor.... There is a Tractor Supply out near where my kids live. I'll stop in and see if they have o-rings.Go to a local John Deere dealer if you have one
D.
DBTroudy
Fullerton, CA
'03 GW GL1800 Yellow
'76 GW GL1000 LTD #859
'75 CB200T
Fullerton, CA
'03 GW GL1800 Yellow
'76 GW GL1000 LTD #859
'75 CB200T
- pidjones
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Re: Searching for an 0-ring substitute for rear master brake reservoir
Haven't had a failure yet. Sometimes I sand the joint a bit after making it if it looks to have glue on the o-ring surface or is a bit misaligned. I really prefer Buna-N (nitrile) in most applications.dbtroudy wrote: ↑Mon Dec 20, 2021 2:38 pmThis is an interesting idea of custom making an 0-ring. How well does the super glue hold up?I buy o-ring stock on eBay, cut to length on 45 degree and glue with super glue to make my own. Been doing it a long time for large hard-to-find o-rings. Lubricate with silicone vacuum grease to ease installation (the reservoirs are tight).
"Love 'em all.... let God sort 'em out!"
Ex 2006 GL1800 - the Black Pearl SOLD! to make room for:
2021 Can-Am Spyder RT Limited Dark Chalk Metallic
1975 Red GL1000 project - ex Pistol Pete project
1972 Triumph T150V Trident rescue - finished and FOR SALE!
1976 Yamaha RD400c
1978 GL1000 with '75 engine - the Hunley
Ex 1978 GL1000
Ex 1979 GL1000
Ex '79 CB750F rat bike
Ex '86 SEi
Ex '77 GL1000
Ex '76 RD400
Ex '72 Penton 125 set up for flat track
Ex '73 RD250
Ex '68 TR6C - chopped
Ex 2006 GL1800 - the Black Pearl SOLD! to make room for:
2021 Can-Am Spyder RT Limited Dark Chalk Metallic
1975 Red GL1000 project - ex Pistol Pete project
1972 Triumph T150V Trident rescue - finished and FOR SALE!
1976 Yamaha RD400c
1978 GL1000 with '75 engine - the Hunley
Ex 1978 GL1000
Ex 1979 GL1000
Ex '79 CB750F rat bike
Ex '86 SEi
Ex '77 GL1000
Ex '76 RD400
Ex '72 Penton 125 set up for flat track
Ex '73 RD250
Ex '68 TR6C - chopped
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Re: Searching for an 0-ring substitute for rear master brake reservoir
All great ideas with one caveat. The o’rings need to be brake fluid compatible rubber which is EPDM or Butyl if I remember right. Normal buna-n rubber will begin to crack and fail when it’s exposed to brake fluid.
Buna-n rubber mineral oil o’rings exposed to brake fluid is not as bad as Nitrile brake fluid rubber exposed to mineral oil which will greatly swell and fail fairly quickly.
You must use the correct rubber o’ring, they are not all the same, you can’t just grab any ol’ o’ring, there is a difference !
(12-25-21) I went back and pulled my rubber manual to see what is recommended for a brake fluid application and see that EPDM, EPT, EPR, SBR & GRS are the highest recommended rubber for non-petroleum brake fluid o’rings. I hope this helps.
Buna-n rubber mineral oil o’rings exposed to brake fluid is not as bad as Nitrile brake fluid rubber exposed to mineral oil which will greatly swell and fail fairly quickly.
You must use the correct rubber o’ring, they are not all the same, you can’t just grab any ol’ o’ring, there is a difference !
(12-25-21) I went back and pulled my rubber manual to see what is recommended for a brake fluid application and see that EPDM, EPT, EPR, SBR & GRS are the highest recommended rubber for non-petroleum brake fluid o’rings. I hope this helps.
Last edited by redglbx on Sat Dec 25, 2021 12:18 pm, edited 1 time in total.
Red 1976 oe owner
1976 LTD restored
1980 CBX , in the que, to fix the ignorant heavy handed owner
1981 CBX
1977 CB750 K7
2014 FJR OE owner, sold
1980 GL1100
1984 GL1200 naked
1969 CL350, in the que
1976 LTD restored
1980 CBX , in the que, to fix the ignorant heavy handed owner
1981 CBX
1977 CB750 K7
2014 FJR OE owner, sold
1980 GL1100
1984 GL1200 naked
1969 CL350, in the que
- BlueThunder
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Re: Searching for an 0-ring substitute for rear master brake reservoir
Google the size and you'll find lots of vendors. Just make sure you get one that is resistant to brake fluulid.
...Brian
2014 CTX1300 Deluxe - BlackThunder aka Predator
1977 GL1000 - Ox
2014 CTX1300 Deluxe - BlackThunder aka Predator
1977 GL1000 - Ox
- LuckyEddie
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Re: Searching for an 0-ring substitute for rear master brake reservoir
I got lucky and was able to order one from CMNSL in Europe a year ago or so. I did have to sign up to be put on a waiting list for a while though. Worth the wait for the correct Honda part...
LuckyEddie
1978 GL1000 Supercharged (Avitar)
1976 GL1000
1980 XS1100LG
1982 XV750J
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1978 GL1000 Supercharged (Avitar)
1976 GL1000
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- Dr. Frankenstein
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Re: Searching for an 0-ring substitute for rear master brake reservoir
FWIW, I've used Brakecrafters for a lot of my brake stuff; a great bunch of guys that will work with you and their stuff is Spot-On plug-n-play; well worth it for these hard-to-find parts. In my experience, if they say it fits, it fits. Quality parts too.
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