Back of 81 Interstate caught on fire!


Information and questions on GL1100 Goldwings (1980-1983)
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rirons0625
Posts: 29
Joined: Mon Apr 04, 2011 7:39 pm
Location: Traverse City, MI
Motorcycle: 1981 GL1100I Interstate

Back of 81 Interstate caught on fire!

Postby rirons0625 » Sat Apr 30, 2011 9:38 pm



I just bought an 81 Interstate that the seller told me he had rebuilt the rear caliper on. He claimed there was a little drag as the brakes had not been broken in yet because he only had put 45 or so miles on the bike since the rebuild. Sounded reasonable to me... I drove the bike only to have the rear shock dust boot catch on fire! With the bike on the center stand and in neutral, the rear wheel could not hardly be turned. I removed the caliper expecting to find it seized, but it worked fine. What I discovered is that the mounting bracket for the caliper was rubbing on the brake disc. My guess is a hot metal shaving came off when driving that landed on the shock boot to catch it on fire. Loosening the axle allowed the wheel to move freely. It does not appear that there is a spacer or anything missing on the brake side of the axle. Does anyone have any ideas? Can the arm that stabilizes the caliper mounting bracket get torqued that could cause the rubbing, and could a guy twist it back outward to eliminate the rubbing? Thanks for your input...



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eklimek
Posts: 307
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Location: St Catharines Ontario Canada
Motorcycle: 81 GL1100 (Widowmaker not in service), 83GL1100, CB350f x 6, CB400f x2, CB550f sold, CL350 (seized engine), plus enough donors to take me through retirement.

Re: Back of 81 Interstate caught on fire!

Postby eklimek » Sun May 01, 2011 1:30 pm

Is there a spacer/bushing on both sides of the caliper mount?

Ed

goldtr6c
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Re: Back of 81 Interstate caught on fire!

Postby goldtr6c » Sun May 01, 2011 3:12 pm

I had a similar experience with my 82 which sat for almost 2yrs after we got a direct hit from huricane Ike. Turned out the brake peddle was hanging up when depressed and causing the brake to drag. It didn't catch fire but it did smoke and turn the disc a dark blue. A couple shots of oil on the peddle cured the problem.

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WingAdmin
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Re: Back of 81 Interstate caught on fire!

Postby WingAdmin » Sun May 01, 2011 3:50 pm

There are two causes of this, and both are fairly common - one more than the other.

The first is the brake pedal pivot itself getting corroded. Easy to test for: move the pedal up and down with your hand. If it's stiff, you need to remove it, polish the pivot smooth and remove rust, grease it, and reinstall.

The second (more common) cause is the brake return port inside the rear master cylinder. Have a look at How to rebuild your rear master cylinder, starting at step 17. This tiny port gets clogged with muck - this is where the brake fluid returns to the master cylinder when you let up off the brakes. The problem is, it gets clogged, blocking the fluid from returning. You use the brakes a couple times, the caliper heats up, the fluid inside the caliper heats up, and expands. Normally it would just push back up into the caliper, but because this port is blocked, it does the only thing it can do - it pushes the pistons out, which causes your brake pads to either drag, or lock the wheel entirely.

It's a relatively simple fix, and you get to flush and bleed your brake system as an added bonus.

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RoadRogue
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Location: Castlegar BC, Canada
Motorcycle: 1997 1500SE

Re: Back of 81 Interstate caught on fire!

Postby RoadRogue » Tue May 03, 2011 10:34 pm

I would be looking for either a missing spacer between the wheel and caliper mount or the spacers on each side of the caliper mount are reversed(inside spacer mounted on the outside and vise-versa) that would cause the mount to be shifted off center in relation to the rotor when you tighten the axel nut.
Ride safe, Todd
Over night campers welcome

rirons0625
Posts: 29
Joined: Mon Apr 04, 2011 7:39 pm
Location: Traverse City, MI
Motorcycle: 1981 GL1100I Interstate

Re: Back of 81 Interstate caught on fire!

Postby rirons0625 » Wed May 11, 2011 8:53 am

UPDATE... eklimek & RoadRogue hit it on the head! Someone had the spacers in the wrong location on the axle. Once that was corrected, the caliper bracket came over to where it no longer hits the rotor. It was only then that I discovered the brake dragging also, but as WingAdmin suggested I ended up tearing down and cleaning up the rear master cylinder - twice actually...arrggh! Excellent "how to's" on this sight! My rear wheel and brake seems to be functioning as it should now. Thanks again everyone for your input and assistance!

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RoadRogue
Posts: 1917
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Location: Castlegar BC, Canada
Motorcycle: 1997 1500SE

Re: Back of 81 Interstate caught on fire!

Postby RoadRogue » Wed May 11, 2011 11:04 pm

glad it worked out for you


Ride safe, Todd
Over night campers welcome


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