New kid and another rear master cylinder issue


Information and questions on GL1100 Goldwings (1980-1983)
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amd1229
Posts: 3
Joined: Mon Apr 13, 2015 5:47 pm
Location: New Jersey
Motorcycle: 1983 GL1100

New kid and another rear master cylinder issue

Postby amd1229 » Mon Apr 13, 2015 6:00 pm



Hello all! I just picked up an '83 Gl1100 in pretty good shape....except the back brake. I've rebuilt a few rear master cylinders so I'm fairly confident I did this one correctly. In fact, I did it correctly twice only to to conclude that the actual aluminum assembly piece itself is not in good condition. The pedal continues to be soft and I'm getting that squishy sound. So I've spent the last 2 days online trying to source the OEM part and it looks like it is discontinued. Every parts place has it in the exploded diagram with either no part number or its labeled discontinued. Rebuild kits are plentiful but I've already gone through 2 of them. I read on another Goldwing site that you can use one off of an 1800 with some modifications so I ordered one off of an '04. Now I'm skeptical because the '04 1800 MC has a banjo bolt where the one off of the '83 has more of a flanged bolt. SO...any ideas? Anybody have an extra '83 MC lying around? Any comments on the Frankensteining the 1800 part?

And for what its worth, I'm excited to finally be part of this wonderful community!



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spiralout
Posts: 1049
Joined: Sun Feb 17, 2013 6:41 pm
Location: Alabama
Motorcycle: 1975 GL1000 (gone)
1980 GL1100I (with '77 1000 engine)
1996 GL1500 SE

Re: New kid and another rear master cylinder issue

Postby spiralout » Mon Apr 13, 2015 7:50 pm

Have you inspected your M/C bore for gunk, pitting or scratches? (Wadded up aluminum foil makes a good scrubber/polisher) Have you mic'd the bore to check the service limit? The '83 ID is larger than the previous years. Could be possible you got kits for a different year. A lot of the sellers on Ebay don't know the difference.

Are you losing fluid from the M/C? Could just need a good bleeding.
As far as adapting the 1800 rear master, I wish I'd read that article before spending over $100 and months searching to find an original. My '80 had banjo fittings so it would have been no problem. I don't know how much of pain it'd be to unlink yours and change over to banjos.

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spiralout
Posts: 1049
Joined: Sun Feb 17, 2013 6:41 pm
Location: Alabama
Motorcycle: 1975 GL1000 (gone)
1980 GL1100I (with '77 1000 engine)
1996 GL1500 SE

Re: New kid and another rear master cylinder issue

Postby spiralout » Mon Apr 13, 2015 8:00 pm

Apologies for the double post, but I forgot...
Welcome the the forums!

amd1229
Posts: 3
Joined: Mon Apr 13, 2015 5:47 pm
Location: New Jersey
Motorcycle: 1983 GL1100

Re: New kid and another rear master cylinder issue

Postby amd1229 » Mon Apr 13, 2015 8:03 pm

Hi Spiralout! Many thanks for all of the good info. I'm going to remove the mc once again and check it against your information. I just can't figure it out.
And thanks for the warm welcome!!

:D

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bruce swaybill
Posts: 64
Joined: Wed Dec 11, 2013 11:26 pm
Location: farmington, ct
Motorcycle: 1983 gl1100i interstate

Re: New kid and another rear master cylinder issue

Postby bruce swaybill » Tue Apr 14, 2015 4:29 pm

If the piston matches the bore diameter, have you tried "reverse bleeding" the system?

My rear and front are not linked any more as from the factory; reverse bleeding did the trick for me, it should work even if they are still linked.

Also, that table has errors. While it lists an 83 rear master cylinder bore that is different from the 82, all the other diameters are different for an 83 (not the same as an 82, shown as 82-), including the calipers.

Bruce S.
Have a nice day! :)

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spiralout
Posts: 1049
Joined: Sun Feb 17, 2013 6:41 pm
Location: Alabama
Motorcycle: 1975 GL1000 (gone)
1980 GL1100I (with '77 1000 engine)
1996 GL1500 SE

Re: New kid and another rear master cylinder issue

Postby spiralout » Tue Apr 14, 2015 10:51 pm

bruce swaybill wrote:
Also, that table has errors. While it lists an 83 rear master cylinder bore that is different from the 82, all the other diameters are different for an 83 (not the same as an 82, shown as 82-), including the calipers.

That chart is a out of the GL1100 Honda Factory Service Manual but seems like I remember reading somewhere that the '83 has 32mm rear calipers.

amd1229
Posts: 3
Joined: Mon Apr 13, 2015 5:47 pm
Location: New Jersey
Motorcycle: 1983 GL1100

Re: New kid and another rear master cylinder issue

Postby amd1229 » Wed Apr 15, 2015 6:08 am

Thanks for the input, guys. I was able to source a new assembly from a salvage yard out in Illinois. And wow, not cheap! Since '83 was the only year the brakes were as such, this part is very hard to find. Nonetheless, I went for it. Should be here within a week. If after this install I'm still having trouble, then I can conclude the issue is with me and no doubt, I will be back here seeking more guidance.
Thanks!!




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