GL1100 '82 vs '83 front master cylinder. - Steve Saunders Goldwing Forums

 
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post #1 of 6 (permalink) Old 05-19-2009, 10:13 PM Thread Starter
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Year: 1980-81-82-83
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I just bought an '83 front master cylinder for my '82 GL1100, '82 one had a cap screw busted off in it and leaks all over the place. The new one would not build pressure, lever comes all the way back to the handlebar (properly bled and all other components completely checked out) it only offers about 20% front brake.

Not knowing there was a difference between the 2 year models I ordered an '82 model rebuild kit, while I was waiting I put the '82 back on and it and apart from it leaking like a stuck pig, it worked fine, when thekit arrived it was obvious it was of a wider diameter than the cylinder I was trying to fit it into, soI did some research and found out about the difference in the 2 year models, sent it back and got the right one for the '83 master cylinder that I had, that didn't leak, fitted the smaller kit and it fits great.

This eveninga friend and I set about bleeding this thing and lo and behold, we gotexactly the same result, all the way back to the bar and 20% brake.

My questions to you guru's are these:- Does the smaller diameter of the '83 make it impossible to build sufficient pressure to operate with '82 equipment? Or, do I just have a damaged '83 cylinder? It for sure looks smooth inside there, Have any of ya'all ever even had this problem?I sure would like to hear any input you guys can give me, thanks.



For what it's worth and if I may be so bold? The current rebuild of the `80, `81, `82 & `83 GL1100STDASPENSTATE can be followed on classicgoldwings.com in a thread called "The plan is to turn 140,000 into 50,000."

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post #2 of 6 (permalink) Old 05-19-2009, 10:53 PM
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Well, if you think of it this way.... The '83 master pumps enough fluid to operate only 1 caliper, the '82 has to pump fluid to 2 calipers. Both are dual piston calipers, but the diameters also differ.

So the '83 master cylinder is trying to pump up 2 calipers, that it was not designed for.

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post #3 of 6 (permalink) Old 05-20-2009, 12:06 AM Thread Starter
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Well Sam, you did it again, I had no Idea that the '83 only had 1 disc on the front, never would have dreamed it, you truly are my mentor, Sir, like it or not.

For what it's worth and if I may be so bold? The current rebuild of the `80, `81, `82 & `83 GL1100STDASPENSTATE can be followed on classicgoldwings.com in a thread called "The plan is to turn 140,000 into 50,000."

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post #4 of 6 (permalink) Old 05-20-2009, 12:14 AM
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It has 2 in the front, but the other front caliper is tied to the brake pedal and the rear brake. Starting in '83 it's pretty much that way.

1997 GL1500 SE Pearl Sapphire Black
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post #5 of 6 (permalink) Old 05-20-2009, 12:28 AM Thread Starter
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I know what your talking about now, split braking, did read something about it in the manual, but didn't think it would make as much difference as that, you do know that Moto Guzzi came up with that first in the '70's, thanks Sam. You da man!!!

For what it's worth and if I may be so bold? The current rebuild of the `80, `81, `82 & `83 GL1100STDASPENSTATE can be followed on classicgoldwings.com in a thread called "The plan is to turn 140,000 into 50,000."

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post #6 of 6 (permalink) Old 05-20-2009, 06:12 AM
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I just put a 1500 master on my 83 1100 works great
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