80 GL1100

Information and questions on GL1100 Goldwings (1980-1983)
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80 GL1100

Post by echinus1988 » Wed May 21, 2014 11:51 pm

Well, I'm at it again!

Got the bike running but having a problem with the rear brakes.

Cool weather (ie, night) they work great but during the day, they get hot and start pressing down on the disk until the rear tire will barely turn. I can smell how hot the brakes are when they do this.

I have rebuilt the rear master cylinder, rear caliper.

What I missed doing was greasing the piston and seal. I'm doing that tomorrow. Hopefully that will solve my problem of dragging. If not, I have to go back to the drawing board.

My question has to do with the pads. Due to the drag, my pads are down to almost nothing on the inside pad, the outside pad is down but not as bad.

There is supposed to be a shim on the inside pad. It's missing and has been since before I got the bike. Can I just replace the pads without the shim or will that cause a problem still?

Any other ideas will be appreciated. Thank you all for your knowledge and help!

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Re: 80 GL1100

Post by WingAdmin » Thu May 22, 2014 9:21 am

Time to go at that master cylinder again. The return hole in your master cylinder is not allowing fluid to return. When the brake heats up, the fluid expands. Because the return hole is blocked, it can't push back up into the master cylinder, and from there into the reservoir like it's supposed to. It has to go somewhere, and the only thing it can do is push the piston out, which engages the brake pads on the disc. This heats it up even more, which heats the fluid more, which makes it expand more, which makes the piston push out more...

You need to clean out that return hole again in the master cylinder.

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Re: 80 GL1100

Post by virgilmobile » Thu May 22, 2014 10:19 am

While your at it,remove the calipers and clean out the stuff that's crusted under the piston seal rubber ring.
When your done the piston should be able to be pushed to the bottom with a good squeeze.Nice and firm,not needing a vice kinda thing.

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Re: 80 GL1100

Post by BikerBuck » Thu May 22, 2014 1:26 pm

And make sure the brake pedal is returning to the up position. Have had it stick down on a couple of Wings.

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Re: 80 GL1100

Post by Patriccio » Mon May 26, 2014 9:45 pm

You may want to check the manual because I thought the pistons had to be lubed w/ brake fluid when you rebuild the calipers.

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Re: 80 GL1100

Post by echinus1988 » Mon May 26, 2014 11:07 pm

As usual, it was my error.

Everyone told me to clear the return hole. I thought I had done that. There are two holes, one very small. I downloaded the instructions, bought a wire brush, cut off one stand, and cleared the hole and everything works fine.

As usual, this site is the best place to go! My bike is running and I synchronized my carbs the correct way today and it runs so much better. Thanks to everyone.

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