Clutch and Brake Master Cylinders


Information and questions on GL1500 Goldwings (1988-2000)
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jenagle
Posts: 79
Joined: Tue May 13, 2014 9:56 pm
Location: Adrian, MO
Motorcycle: 1981 Goldwing 1100
1989 Goldwing 1500

Clutch and Brake Master Cylinders

Postby jenagle » Sun Sep 21, 2014 9:54 pm



I have an 89 Goldwing where both the clutch and brake master cylinders are corroded and the sight glasses are clouded to the point that you can't see any level of fluid. Partzilla says they are both out of stock for the 89 model year, but they list in-stock for the year 2000. My question is will the 2000 GL1500 parts fit and work on the 89 that I have?



rzaugg
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Location: Cedar Rapids, Ia
Motorcycle: 1984 GL1200 Aspencade
1989 GL1500 Aspencade

Re: Clutch and Brake Master Cylinders

Postby rzaugg » Mon Sep 22, 2014 10:12 pm

I got on the website of my local dealer. By the breakdown (exploded view), they seem the same and a lot of the internal parts are the same part number. But they are different part numbers for the assemblies. I would recommend that you call your dealer and see if they will give you the procession of the part numbers and whether the number for the 89 is superceded to the number for the 2000. My guess is yes, but I would call them to be sure. If your dealer won't tell you, let me know, I have a good relationship with the parts manager at my dealer and he is very good at what he does. I'll find out for you.

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jenagle
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Motorcycle: 1981 Goldwing 1100
1989 Goldwing 1500

Re: Clutch and Brake Master Cylinders

Postby jenagle » Tue Sep 23, 2014 12:48 am

Thanks. I'll let you know what I find out.

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WingAdmin
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Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
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1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Clutch and Brake Master Cylinders

Postby WingAdmin » Tue Sep 23, 2014 11:15 am

I had a look in the Cyclemax parts catalog, and the part numbers for the front master cylinder assembly change not only from year to year, but from trim line to trim line (i.e. Interstate is different than Aspencade). I got as far as 1992, and at that point had 7 different part numbers from 7 different bike year/trim lines.

However...whether or not that means they won't FIT and WORK is not obvious. Part numbers can change for the tiniest reasons. You may very well pick a 2000 SE front master cylinder, bolt it in place, and it will work perfectly.

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jenagle
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Location: Adrian, MO
Motorcycle: 1981 Goldwing 1100
1989 Goldwing 1500

Re: Clutch and Brake Master Cylinders

Postby jenagle » Tue Sep 23, 2014 2:22 pm

Went to the local Honda dealer parts department over the lunch hour, and the clutch master cylinder is the same up through 2000. The brake master cylinder is only good on '88 and '89 models. However, as you say they change the part numbers for the most arcane (read monetary) of reasons, so I'm going to try the 2000 brake master cylinder and see how close it comes. NO I DO NOT HAVE A DEATH WISH! I will, however let everyone know how things go. Just waiting on payday.

Grasshutperformance
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Location: Detroit MI.
Motorcycle: 1977 GL1000

Re: Clutch and Brake Master Cylinders

Postby Grasshutperformance » Tue Sep 23, 2014 9:46 pm

Do you have the diameters of both masters? That is the big thing. If the piston diameter is correct, unless the stroke is WAY different you should be fine. There may be an issue if the brake line bolts on in a different location, but that is easily enough fixed with a new brake line. If the diameters are the same I think you are golden, if they are not, then you need to do the math and see if it will still work.
Tom

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jenagle
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Motorcycle: 1981 Goldwing 1100
1989 Goldwing 1500

Re: Clutch and Brake Master Cylinders

Postby jenagle » Tue Sep 23, 2014 10:01 pm

Thanks. I'll let you know. The lines appear to be the same, with the same diameter bolt attaching the line. As far as the cylinder diameter, I don't know until I get the parts in hand.

Grasshutperformance
Posts: 42
Joined: Mon Jun 16, 2014 1:00 pm
Location: Detroit MI.
Motorcycle: 1977 GL1000

Re: Clutch and Brake Master Cylinders

Postby Grasshutperformance » Tue Sep 23, 2014 11:06 pm

jenagle wrote:Thanks. I'll let you know. The lines appear to be the same, with the same diameter bolt attaching the line. As far as the cylinder diameter, I don't know until I get the parts in hand.

You should be able to look that up. Sometimes it is a PITA but usually there should be some info somewhere, maybe the rebuild kits list the diameter. I am sure you will be fine, 99.9% sure anyway! LOL!
Tom

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WingAdmin
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1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Clutch and Brake Master Cylinders

Postby WingAdmin » Wed Sep 24, 2014 10:18 am

Grasshutperformance wrote:
jenagle wrote:Thanks. I'll let you know. The lines appear to be the same, with the same diameter bolt attaching the line. As far as the cylinder diameter, I don't know until I get the parts in hand.

You should be able to look that up. Sometimes it is a PITA but usually there should be some info somewhere, maybe the rebuild kits list the diameter. I am sure you will be fine, 99.9% sure anyway! LOL!
Tom


The cylinder diameter will be the same - Honda uses the same piston on many, many bikes. The same front brake master cylinder rebuild kit fits GL1000's, GL1100's, GL1200's, GL1500's, PC800's, and many other models. So it's possible the stroke might be different - but I kind of doubt it.

Grasshutperformance
Posts: 42
Joined: Mon Jun 16, 2014 1:00 pm
Location: Detroit MI.
Motorcycle: 1977 GL1000

Re: Clutch and Brake Master Cylinders

Postby Grasshutperformance » Wed Sep 24, 2014 10:45 am

WingAdmin wrote:The cylinder diameter will be the same - Honda uses the same piston on many, many bikes. The same front brake master cylinder rebuild kit fits GL1000's, GL1100's, GL1200's, GL1500's, PC800's, and many other models. So it's possible the stroke might be different - but I kind of doubt it.

I would agree that the likelihood of the stroke being different is slim. I am surprised they used the same bore in all those apps, the GL1000 has the master operate both front calipers, the 1200 and up only works one caliper. But now that I think of it, I do think the 1200 and up use 2 piston calipers, not sure of diameters. I do plan on putting a different bore master on my 1000, the stock one is WAY too stiff, and far too little feel. At least now I know when I put on my hydraulic clutch the master will be easy to choose!
Tom




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