Master cylinder question


Information and questions on GL1200 Goldwings (1984-1987)
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harkgold
Posts: 147
Joined: Thu Nov 03, 2011 9:19 pm
Location: Des Moines, Iowa
Motorcycle: 1984 GL1200 Interstate

Master cylinder question

Postby harkgold » Mon Apr 30, 2012 3:04 pm



In the process of restoring my 84 GL1200 Interstate I notice that the sight glass on the brake master cylinder on the handlebar is leaking brake fluid.
I'm wondering if the sight glass is fixable, replaceable, or do I need to replace the entire master cylinder?
The master cylinder has other issues as well as it needs to have a rebuild kit installed. However, I don't want to invest in a rebuild kit if the sight glass is not reparable.

Thanks for your in put!

Harkgold :D



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WingAdmin
Site Admin
Posts: 17046
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Master cylinder question

Postby WingAdmin » Mon Apr 30, 2012 3:31 pm

It's a pretty common failure. Some people knock the old glass out of there, fit a dime in its place, seal it with J-B Weld, and call it good:

Sight glass dime repair
Sight glass dime repair


There are other options - this outfit claims to sell sight glass replacement kits for all motorcycles. You can also find similar vendors like this one on eBay.

harkgold
Posts: 147
Joined: Thu Nov 03, 2011 9:19 pm
Location: Des Moines, Iowa
Motorcycle: 1984 GL1200 Interstate

Re: Master cylinder question

Postby harkgold » Mon Apr 30, 2012 4:39 pm

[quote="WingAdmin"]It's a pretty common failure. Some people knock the old glass out of there, fit a dime in its place, seal it with J-B Weld, and call it good:

Hey!....thanks for the tip!

I've already got a tube of J-B and I'm sure I've got a dime in my pocket.
But, I'm wondering how difficult the glass is to remove. Do I just bust it out with a punch or something?
Also, I see in the photo that the dime is not visible. It appears a dime is put into place and then the J-B Weld just smoothed over the top of the dime to seal the dime in place.

A dime and a littele J-B is better than spending a minimum of $15.00 bucks for a sight glass kit. Heck it doesn't bother me to remove the cover periodically to check the fluid level once in a while.

Harkgold :D

User avatar
WingAdmin
Site Admin
Posts: 17046
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Master cylinder question

Postby WingAdmin » Mon Apr 30, 2012 4:57 pm

I believe the sight glass is held in with two metal rings - but I think it can be pushed out from inside, along with the rings. However, that's going by memory.




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