GL1100 1982 rear caliper problem


Information and questions on GL1100 Goldwings (1980-1983)
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marcieclark17
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Motorcycle: 1982 Goldwing Interstate

GL1100 1982 rear caliper problem

Postby marcieclark17 » Mon Oct 04, 2010 5:59 pm



I have read what I could find posted regarding problems with the rear caliper, but have not seen one yet that talks about why the top seal would come apart. My rear brake was sticking a bit, but would release and work OK after riding a few miles. Last Friday I rode about 60 miles and parked in the drive, with everything working OK. When I went back out for another ride, the rear brake was almost frozen up completely. I tried bleeding the brakes with a MityVac, to see if replacing all of the fluid with new would clear out the small return port that so many have found to be the issue with rear brakes locking. All that came out (it was pretty dark colored, not clear or pale yellow) was about enough for the caliper. Further attempts to drain the system met with no results, even when pumping the pedal nothing more came out. I cracked the banjo bolt, and immediately got some leakage around it. Then when pumping the pedal, fluid flowed freely from around the banjo bolt connection. I took off the caliper and pulled the pads. The pistons are stuck in the bore (both of them) with threads of rubber sticking out of the bores, which I take to be the disintegrated top seal. 50 PSI air pressure will not dislodge them. Is my caliper shot, and I just need to get one from my local bike salvage yard? Just curious as to what could make such a thing happen. I just bought this bike, and it was sticking slightly when I brought it home. Is it possible that a previous owner used an incorrect seal during a previous rebuild? Thanks in advance for any advice anyone can furnish to a Goldwing newbie.



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WingAdmin
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Re: GL1100 1982 rear caliper problem

Postby WingAdmin » Mon Oct 04, 2010 7:25 pm

Those top seals do tend to disintegrate just like you said. When you say you cracked the banjo bolt - do you mean the bolt on the caliper, or the bolt on the master cylinder?

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virgilmobile
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Re: GL1100 1982 rear caliper problem

Postby virgilmobile » Mon Oct 04, 2010 7:53 pm

I have delt with brake problems on 3 different bikes.Each one had the same problems,lack of preventive maintenance.Moisture condenses in the fluid system causing rust and oxidation on any aluminum and steel parts.I have found under the seal,in the slave piston,a white powder(aluminum oxide)that swells up and binds the piston in the hole.I got that one out by adapting a grease fitting to the brake and pumping it out.Hand pumps will develop a lot pressure.I have also used the master cyl to pump it out.Just clean,clean,clean,and reassemble.Everything should move by hand not a hammer.

Bookie
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Re: GL1100 1982 rear caliper problem

Postby Bookie » Tue Oct 05, 2010 2:16 am

Had a similar problem after rebuilding my rear calipers. The brake worked fine for a couple of days then started to bind. When I took the caliper apart there was a small rubber strip as you described in one piston. I eventually got the piston out using air pressure but it was hard. Turned out the top seal had twisted in its seat when I had installed the piston and that caused a tiny strip to be cut by the piston. Replaced the seals and very carefully reinstalled the piston. Been fine for about a year now. Good luck.

marcieclark17
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Motorcycle: 1982 Goldwing Interstate

Re: GL1100 1982 rear caliper problem

Postby marcieclark17 » Tue Oct 05, 2010 8:07 am

It was the banjo bolt on the caliper. Sorry, I should have been more clear on that. Does anyone know what pressure is developed by the rear master cylinder? That may be higher, or somehow more effective, than the air pressure I tried to use. I will reconnect the caliper and try pumping it out with the brake fluid today. Thanks a million for the quick responses to my inquiry. Sure glad I found this site. I have read just about every one of the how-to articles. Thanks to those who are more knowledgeable for sharing their time to prepare such high quality articles. I am getting ready to change the oil, coolant and final drive fluid this weekend. Should be a breeze thanks to all of the effort by others to help us newbies. That article on how to winterize is especially timely. I am going to use the seafoam in all of my mowers and emergency generator engine to stabilize the gasoline. Can't wait to see how contaminated the oil in this old beast is.

marcieclark17
Posts: 4
Joined: Sun Sep 19, 2010 12:18 pm
Location: Lees Summit, MO
Motorcycle: 1982 Goldwing Interstate

Re: GL1100 1982 rear caliper problem

Postby marcieclark17 » Tue Oct 05, 2010 2:29 pm

I hooked the caliper back up and pumped the brake pedal. It took a while, but the pistons finally started moving. Finally got them out, found a rebuild kit at a shop here in town, and am on the way to getting back on the road. Thanks to everyone who helped.

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virgilmobile
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83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: GL1100 1982 rear caliper problem

Postby virgilmobile » Wed Oct 06, 2010 7:24 am

When rebuilding,scrape the crusty stuff out of the groove where the piston seal goes.Remove the bleeder and the piston should push in with hand pressure and a little brake fluid for lube.Pre-fit the piston before the seal is put in.It should fit smoothly with no binding.




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