New guy with a question about rear brakes


Information and questions on GL1100 Goldwings (1980-1983)
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libertymtn76
Posts: 3
Joined: Sat May 30, 2015 12:41 am
Location: St. Helens Oregon
Motorcycle: 1981 GL 1100 I

New guy with a question about rear brakes

Postby libertymtn76 » Sat May 30, 2015 1:15 am



Hi Guys, I'm new on here and have a question.
My current ride is an 81 Goldwing GL 1100 I.
That I have revived from the pasture.
I'm At the end of the build with a brake problem.
The problem is with the rear brakes, that were seizing.
So I pulled the calipers off, and proceeded to clean all
the gunk out. And put a new seal kit in it, after getting
all the crap out of it. I reassembled everything,
making sure that the seals were in correctly. Bled it off
and it solved the seizing problem. But started to leak.
Is it reasonable to say that over the years the pistons have lost
meat in the diameter of the piston? Due to the fact that
there are few and far between, of calipers to be had for the
four year span of 80 to 83 bikes. Would it be fare to say that
the calipers last longer than the pistons?
And should the pistons be replaced with new?



User avatar
Aussie81Interstate
Posts: 679
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: New guy with a question about rear brakes

Postby Aussie81Interstate » Sat May 30, 2015 1:26 am

As long as the pistons are not totally rust pitted - or pitted in the working area (the part that the seal covers), they should not leak or lose "meat".

Have you got any pictures of the pistons. The whole brake system needs to be really clean - the groove where the seal goes is mot important to be clean as a whistle. There is usually a lot of build up in the old calipers as moisture and fluid get under the seal and start to corrode the aluminium- making the seal go hard and pushing it onto the piston - and not letting it retract properly - hence the seizing. You might need to disassemble the caliper again and give the it a good clean up again - plus reinspect the pistons for corrosion. I'm sure you could get some new pistons on ebay as well

User avatar
redial
Posts: 1993
Joined: Mon Jan 03, 2011 1:17 am
Location: Kapunda, SouthAustralia
Motorcycle: 1997 GL1500 Spectre Red Aspencade

Re: New guy with a question about rear brakes

Postby redial » Sat May 30, 2015 11:02 am

Hi there New Guy,
Although it is an Australian Ebay reference, the seller is in the USA. Try this for a rebuild kit:
http://www.ebay.com.au/itm/like/3809796 ... 107&chn=ps
Len in Kapunda

The world is not going to finish today, as it is already tomorrow in Australia and New Zealand, and other islands of foreign nations such as Guam and Samoa.

libertymtn76
Posts: 3
Joined: Sat May 30, 2015 12:41 am
Location: St. Helens Oregon
Motorcycle: 1981 GL 1100 I

Re: New guy with a question about rear brakes

Postby libertymtn76 » Sat May 30, 2015 2:00 pm

Thanks for the reply Aussie81. I did find a lot of gunk in the caliper and the groove and got all that cleaned out. That's why I was wondering if some of the meat had worn away over the years. It wasn't leak before I rebuilt the caliper. Which I suspect was from the gunk build up in the caliper. But now that it's all clean now. My thinking was that the piston had worn to where it wont seal anymore. So I guess my next step will be to get some new piston from ebay. Thanks again

harvey01
Posts: 628
Joined: Thu May 31, 2012 7:14 pm
Location: Henrico, Virginia
Motorcycle: 2004 GL1800

Re: New guy with a question about rear brakes

Postby harvey01 » Sat May 30, 2015 3:24 pm

You might want to check with J&P cycles as I know they have the K & L repair kits. Might give ebay a price run. Or not!

Another possible source is Dennis Kirk!
harvey
Ride Safe and Ride Often

libertymtn76
Posts: 3
Joined: Sat May 30, 2015 12:41 am
Location: St. Helens Oregon
Motorcycle: 1981 GL 1100 I

Re: New guy with a question about rear brakes

Postby libertymtn76 » Sun May 31, 2015 10:34 pm

Thanks Harvey kinda movin in that direction ;)

harvey01
Posts: 628
Joined: Thu May 31, 2012 7:14 pm
Location: Henrico, Virginia
Motorcycle: 2004 GL1800

Re: New guy with a question about rear brakes

Postby harvey01 » Mon Jun 01, 2015 7:53 am

Just got the GoldwingDocs monthly newsletter and became aware of a site selling brake pistons for the various gold Wings: http://www.wingovations.com/

They are new stainless steel pistons, so if you go that route you might also want to check there.


harvey
Ride Safe and Ride Often


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