'83 GL1100I Front Master Cylinder Rebuild


Information and questions on GL1100 Goldwings (1980-1983)
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MedicMike
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'83 GL1100I Front Master Cylinder Rebuild

Postby MedicMike » Wed Sep 28, 2011 9:35 pm



Hey Guys and Gals:

Hoping for some help. I've been slowly fixing my '83 GL1100I. I rebuilt the front caliper last week and then couldn't get the brakes to bleed, even with the Mity-Vac. I realized that the piston in the front master cylinder was sticking and not releasing all the way. I received the parts today and rebuilt it. The piston travels smoothly now, but same thing, no fluid movement. I've even left the banjo bolt off and tried to pump the lever and see if any fluid comes out from the master cylinder, with no luck whatsoever. Any ideas? Thanks.

MM



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WingAdmin
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Re: '83 GL1100I Front Master Cylinder Rebuild

Postby WingAdmin » Thu Sep 29, 2011 9:17 am

So even with the master cylinder rebuilt, reservoir full of fluid, Mity-Vac on the bleeder nipple drawing vacuum, and pumping the lever, you're still getting nothing out of the bleeder?

MedicMike
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Re: '83 GL1100I Front Master Cylinder Rebuild

Postby MedicMike » Thu Sep 29, 2011 9:56 am

WingAdmin wrote:So even with the master cylinder rebuilt, reservoir full of fluid, Mity-Vac on the bleeder nipple drawing vacuum, and pumping the lever, you're still getting nothing out of the bleeder?
That is correct. It was suggested to me that it can't overcome the air in the line and create enough pressure to move the fluid out into the line.

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Re: '83 GL1100I Front Master Cylinder Rebuild

Postby WingAdmin » Thu Sep 29, 2011 9:13 pm

MedicMike wrote:That is correct. It was suggested to me that it can't overcome the air in the line and create enough pressure to move the fluid out into the line.


I don't think that's the case - I know the Mity-Vac can generate more than enough vacuum to pull fluid through the brake system. There's got to be a blockage somewhere. Have you checked the brake lines themselves to see if they are blocked? Can you suck air through them from the bleeder nipple if the banjo bolt is disconnected at the master cylinder end?

MedicMike
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Re: '83 GL1100I Front Master Cylinder Rebuild

Postby MedicMike » Thu Sep 29, 2011 9:36 pm

WingAdmin wrote:
MedicMike wrote:That is correct. It was suggested to me that it can't overcome the air in the line and create enough pressure to move the fluid out into the line.


I don't think that's the case - I know the Mity-Vac can generate more than enough vacuum to pull fluid through the brake system. There's got to be a blockage somewhere. Have you checked the brake lines themselves to see if they are blocked? Can you suck air through them from the bleeder nipple if the banjo bolt is disconnected at the master cylinder end?


OK, so I just checked this out and the answer is no. I can remove both ends of the brake line and spray a quick shot of brake cleaner thru the brake line. With the caliper end attached, I cannot suck air thru the line. It creates a vacuum, verified with a little hiss when I remove the Mity-Vac from the bleeder nipple. It was also mentioned to see if the return hole in the master cylinder was clear, and I cannot verify this. I've tried to pass a single strand of stiff wire thru with no luck. I did pull the caliper off and was able to get brake cleaner to pass from the bleeder hole out of the connection for the banjo bolt. I hope this info helps. I'm stumped.

dan1951
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Re: '83 GL1100I Front Master Cylinder Rebuild

Postby dan1951 » Thu Sep 29, 2011 9:54 pm

I had a weird problem years ago, I can not even remember which bike it was after owning so many Honda,s But I could not bleed the brake unless the master cylinder cover was left off unsealed or loose. Don,t ask Me why I simply do not know. You might want to try it. Good luck

MedicMike
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Re: '83 GL1100I Front Master Cylinder Rebuild

Postby MedicMike » Fri Sep 30, 2011 2:32 pm

Thank all you guys for your collective effort and knowledge. It's fixed and I rode it today with no problems. I realized had a tiny drill bit that was about the same size. Drilled it out, cleaned it really well and voila... nice and easily bleed brakes. All better. Now to replace my speedo cable that arrived this morning and back on the road. Thanks again and ride safe.

RexAubrey
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Re: '83 GL1100I Front Master Cylinder Rebuild

Postby RexAubrey » Fri Sep 30, 2011 2:35 pm

are you able to pass air or brake cleaner through the banjo bolt it self? I know this sounds stupid but you may have a blockage in the bolt.
Rex
1983 GoldWing Interstate, 1982 GoldWing Aspencade, 1981 Yamaha 550 Maxim, 1979 Yamaha 650 Special

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Re: '83 GL1100I Front Master Cylinder Rebuild

Postby WingAdmin » Fri Sep 30, 2011 5:03 pm

MedicMike wrote:Thank all you guys for your collective effort and knowledge. It's fixed and I rode it today with no problems. I realized had a tiny drill bit that was about the same size. Drilled it out, cleaned it really well and voila... nice and easily bleed brakes. All better. Now to replace my speedo cable that arrived this morning and back on the road. Thanks again and ride safe.


Good, this was exactly what I was going to recommend next, based on your report about the brake line.

That little brake return port in the master cylinder actually serves two purposes: It allows brake fluid to move back up from the caliper, past the piston and into the reservoir - that's it's main purpose. But its second, less well-known purpose is to allow fluid to move from the reservoir, bypassing the piston, and down into the caliper when you are bleeding your brakes by vacuum. If the return port is blocked, you won't be able to bleed.




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