80 goldwing rear caliper


Information and questions on GL1100 Goldwings (1980-1983)
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tallman21
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80 goldwing rear caliper

Postby tallman21 » Fri Feb 18, 2011 1:27 pm



Ok guys, I'm posting again cause I just stripped my bike down and i am now trying to take a look at my rear caliper. I looked through the guide on here but not a manual (still in the mail). Its set up a little differently than the guide, i think it only has one piston.


Anyways i took the two main bolts out and I could not budge the caliper at all. Im guessing its completely frozen? Do i have to bleed the breaks out to release this or what?




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virgilmobile
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Re: 80 goldwing rear caliper

Postby virgilmobile » Fri Feb 18, 2011 1:49 pm

No,loosen the bleeder,tap on the caliper with the butt end of a hammer(don't wail on)just a couple of good wackes should un-stick the piston.Don't forget to scrape under the seal,it swells up there and binds the piston.usually caused by moisture in the fluid.this oxidizes the aluminum.Make sure the piston travels easy in the bore before replacing the seal.

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virgilmobile
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Re: 80 goldwing rear caliper

Postby virgilmobile » Fri Feb 18, 2011 1:54 pm

Oh,by the way,If the rear brake is froze up you might as well do all of them.

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tallman21
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Re: 80 goldwing rear caliper

Postby tallman21 » Fri Feb 18, 2011 2:01 pm

haha yea i plan to do them all just starting with the back one so i can get it into my house and out of the cold snow! Is the bleeder bolt that small one between the 2 main bolts? kinda on the left side in the picture i took

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Re: 80 goldwing rear caliper

Postby littlebeaver » Fri Feb 18, 2011 2:12 pm

8mm wrench will fit it..When you loosen it watch to see if the brakes loosen any..

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tallman21
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Re: 80 goldwing rear caliper

Postby tallman21 » Fri Feb 18, 2011 3:01 pm

awesome thanks guys! i got it off finally. took a lil tapping but it popped off. the piston is realllly rusted. and the back tire finally moves yey!

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Re: 80 goldwing rear caliper

Postby littlebeaver » Fri Feb 18, 2011 3:55 pm

That tells me that the bike has sat for a good while, chances are the return port in the master cylinder is clogged too, I'd remove that too and inspect it and clean it out good because that tiny hole is easily clogged it's flippen small and it won't take much to clog it..

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Re: 80 goldwing rear caliper

Postby WingAdmin » Fri Feb 18, 2011 5:22 pm

If you haven't explored the How-To articles here, now would be the time to go look through the How-To's on rebuilding brake calipers and master cylinders. :)

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tallman21
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Re: 80 goldwing rear caliper

Postby tallman21 » Fri Feb 18, 2011 5:49 pm

good idea guys. Lilbeaver, the guy that owned it before me did ride it last fall and he said that it was running good and everythign was working fine. but who knows

and thanks wingadmin, I have been goign through them like crazy! they are awesome! Allready used the one for removing the seat and rear bags, and as soon as i get the bike in my apt im gonna be able to start tearing apart the calipers and whatever else needs to be redone (which im assuming is a lot). Im assuming ill be posting alot of questions so bear with me guys :)

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Re: 80 goldwing rear caliper

Postby littlebeaver » Fri Feb 18, 2011 6:04 pm

tallman21 wrote:good idea guys. Lilbeaver, the guy that owned it before me did ride it last fall and he said that it was running good and everythign was working fine. but who knows

and thanks wingadmin, I have been goign through them like crazy! they are awesome! Allready used the one for removing the seat and rear bags, and as soon as i get the bike in my apt im gonna be able to start tearing apart the calipers and whatever else needs to be redone (which im assuming is a lot). Im assuming ill be posting alot of questions so bear with me guys :)

Wow, I don't think your going to have too bad a problem then, it's when they sit for a long time that the lines get clogged real bad..Good luck tallman21..Your going to soak up lot's of information here for sure, the guy's here are really good and they have helped me out many times...Sometimes I feel like I'm chasing my tail..ha ha :lol: It's friday don't party to hard tonight..

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tallman21
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Re: 80 goldwing rear caliper

Postby tallman21 » Fri Feb 18, 2011 6:15 pm

i hope it wont be too bad! The bike is really dirty tho and pretty rusty in some areas. I will see if i can get a picture of it up to show you guys. I want to take a look at the cylinders anyways to see how bad they are. If they are really bad ill try and rebuild them. The sad thing is my father tried to get me into building bikes a few years ago when he owned a few harleys but i wasnt into. of course now i am and i dont live anywhere near him! Never to late to learn though.

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Re: 80 goldwing rear caliper

Postby tallman21 » Fri Feb 18, 2011 10:50 pm

Oh and guys, I was looking over the "how to replace rear caliper" article and noticed that the caliper i have is not the same as the one in the howto article. Will the same kit work for this or do i need a different one? there is only one piston on the one i have.

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Re: 80 goldwing rear caliper

Postby imfree » Sat Feb 19, 2011 8:22 am

!980-1981 use the same ,1982 is differant,Have you downloaded the shop manual yet?If not you need to do that it is FREE,I paid fifty five bucks for mine before I found it here,DAAAAA.Joe

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Re: 80 goldwing rear caliper

Postby imfree » Sat Feb 19, 2011 8:48 am

I forgot to tell you,Let me know if you need a caliper,I have one that was on an 81 model that I am doing a total rebuild on,It will have four piston calipers and drilled rotors,It will need it to stop after I put the supercharger with a holly spreadbore carb on it.This is it know,then my 82,with the 81 asp in the back.
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tallman21
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Re: 80 goldwing rear caliper

Postby tallman21 » Sat Feb 19, 2011 11:44 am

i might need one. i gotta go through this one first tho. Just got to see how bad it is.

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Re: 80 goldwing rear caliper

Postby tallman21 » Sat Feb 19, 2011 11:56 am

ok guys so i took the brake pads off and they definitely don't seem like the ones that i would need to order for this specific bike. any idea what kind they are?


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tallman21
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Re: 80 goldwing rear caliper

Postby tallman21 » Sat Feb 19, 2011 3:20 pm

so looking at the caliper, i tried doing what the guide said but had no luck. I didnt see any pins that needed to be taken out. I pumped the brake and the piston didnt come out at all. is the break line clogged do you think?


imfree
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Re: 80 goldwing rear caliper

Postby imfree » Sat Feb 19, 2011 8:19 pm

Make sure it has fluid,take your bleeder screw loose,step on the brake,If you have pressure on the pedal and no fluid coming out of the bleeder screw,then take the line off at the master cyl.and step on the pedal,If fluid goes all over, then fix or replace the line, If no fluid comes out it is the master cyl.Those brake pads in the pic. look just like the ones on my 81.BEFORE you do any thing get a C-CLAMP and remove the cap on the master take the clamp and compress the piston on the caliper sometimes if it is trash plugging the line it will back flush it then you can clean out your reservoir.DO NOT EVER PUT YOUR FINGERS IN BETWEEN THE PISTON AND THE CALIPER WHEN YOU APPLY PRESSURE TO THE PEDAL.Be safe Joe

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Re: 80 goldwing rear caliper

Postby tallman21 » Sat Feb 19, 2011 9:25 pm

yea i checked the bleeder screw before and there was fluid coming out. ill try pusching the cylinder back in.

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Re: 80 goldwing rear caliper

Postby Old Fogey » Sun Feb 20, 2011 11:20 am

When you've got it out and the calliper all cleaned up you'll need a seal kit;
http://www.partsnmore.com/parts/honda/gl1100/?filters[category]=chassis&filters[price]=50&filters[fitting]=custom
For the front callipers use these seals
http://cgi.ebay.com/ebaymotors/81-CB900 ... ccessories

The front and rear brakes all use the same piston on the 80 1100. I can sell you some really nice stainless steel ones so that you never have this problem again! ( although the chart only covers the GLseries to the 1500, we cover a huge range of Honda bikes with the same 10 sizes.)
http://www.wingovations.com/#/stainless ... 4548580412
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'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

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tallman21
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Re: 80 goldwing rear caliper

Postby tallman21 » Sun Feb 20, 2011 11:49 am

so i got it apart. the piston is pretty nasty but the caliper itself isnt to bad. There is only one seal in the well and its on really good condition which is weird. Ill prob just sand down the piston and clean the well out. Took me forever to get it out tho!

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Re: 80 goldwing rear caliper

Postby Old Fogey » Sun Feb 20, 2011 12:10 pm

Maybe it's just me but I just don't get the idea of scrimping and saving when it comes to brakes. Something that your life depends on! One tiny leak and you're in real trouble.
If you look at the Honda pistons or the stainless ones, check how smooth the surface is. Honda chrome plate theirs! They don't do it for the good looks! Plus the fact that the piston to bore and seal fit is compromised by the removal of material off the piston and that you'll never sandpaper it truly round.

One good tip once you have cleaned the cylinder. Use some baking foil (yeah, like steal some out of the kitchen!) rolled up, and scrub the bore of the cylinder with that. You'll be amazed how that cleans it up without removal of material. Take the seal out first!
The groove the seal sits in needs to be scrupulously cleaned out. This where the corrosion will be, behind the seal, that forced it to grab the original piston so tight.
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'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

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tallman21
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Re: 80 goldwing rear caliper

Postby tallman21 » Sun Feb 20, 2011 2:00 pm

well obviosly im not refuting the safety issue. Just that the seal is in great condition and there is very little corrosion going on in the bore. I scrapped it out like you said and it looks nice and shiny!

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Re: 80 goldwing rear caliper

Postby tallman21 » Mon Feb 21, 2011 1:41 pm

ive been sanding the piston but it has some pretty sizable pits in it. should i just buy a new one?

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virgilmobile
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Re: 80 goldwing rear caliper

Postby virgilmobile » Mon Feb 21, 2011 4:33 pm

I hear that the seal looks good.Please remove the seal from the caliper and look at the groove.It is verrrrrry common to have oxidation in the groove.Caused by moisture.Even a little will push against the rubber seal and cause binding in the piston.You should be able(with a little lube)push the piston to the bottom by hand after cleaning.I just did this on 3 bikes,80,83,84.Every caliper had a white powder caked under the seal.Every one was binding to some degree.




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