bleeding the brakes 1983 1100


Information and questions on GL1100 Goldwings (1980-1983)
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noelcassidy
Posts: 33
Joined: Mon Nov 16, 2009 7:43 pm
Location: walpole NH
Motorcycle: 1983 GL1100 aspencade

bleeding the brakes 1983 1100

Postby noelcassidy » Sat Jan 02, 2010 10:13 am



I rebuilt the rear brake master cylinder and the rear caliper. I realize that this bike has the linked brake system, rear caliper linked to the right front caliper when depressing the foot peddle. I was able to bleed the front caliper out and it works as it should, the rear is another story. I cannot get fluid to flow into the rear caliper. Tried reverse bleeding with a pressure bleeder through the rear caliper to the master cylinder but no luck there. The brake peddle has good pressure with no spongey feeling.
Could I have a blocked brake line going to the rear caliper or am I missing something in the bleeding process? Any help appreciated.



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WingAdmin
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Posts: 17046
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: bleeding the brakes 1983 1100

Postby WingAdmin » Sun Jan 03, 2010 7:33 pm

Have you tried a vacuum bleeder on the rear caliper?

noelcassidy
Posts: 33
Joined: Mon Nov 16, 2009 7:43 pm
Location: walpole NH
Motorcycle: 1983 GL1100 aspencade

Re: bleeding the brakes 1983 1100

Postby noelcassidy » Mon Jan 04, 2010 7:36 am

I have tried a vacuum bleeder with no suckcess (pardon the pun). The one I have is a mightyvac, in my opinion not a very powerful unit.

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WingAdmin
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1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: bleeding the brakes 1983 1100

Postby WingAdmin » Mon Jan 04, 2010 7:57 am

The Mightyvac does not develop tremendous vacuum (I have one, too) but it is more than enough to bleed brakes. You may have a blockage somewhere - is the bleeder screw blocked, perhaps? If you remove the screw altogether, does it bleed?

noelcassidy
Posts: 33
Joined: Mon Nov 16, 2009 7:43 pm
Location: walpole NH
Motorcycle: 1983 GL1100 aspencade

Re: bleeding the brakes 1983 1100

Postby noelcassidy » Mon Jan 04, 2010 8:05 am

The bleeder screw is not blocked as I can blow through it. I pumped brake fluid into the caliper with no problem but that is as far as it would go. I loosened the brake line to the caliper and pumped fluid that far, tightened the brake line and tried pumping to the rear master with no luck. I may try to follow the line and see if there is a splitter block between the front line and the back line. My thought is because the bike sat for 10 years the rear line may have a blockage and need to be cleaned out or replaced. The reason I think this way is because the rear brake peddle pressure is right up where it should be with no spongey feeling.

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WingAdmin
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Posts: 17046
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: bleeding the brakes 1983 1100

Postby WingAdmin » Mon Jan 04, 2010 8:09 am

Sounds like you have done exactly what I would have done, with the same conclusions. I've never heard of a brake line blockage, but there's always a first time for everything.

Actually, I'd put my money on the splitter. :)

noelcassidy
Posts: 33
Joined: Mon Nov 16, 2009 7:43 pm
Location: walpole NH
Motorcycle: 1983 GL1100 aspencade

Re: bleeding the brakes 1983 1100

Postby noelcassidy » Mon Jan 04, 2010 6:20 pm

My suspicions were correct. The rubber brake line from the rear caliper to the metal line did have a blockage in it. I ran a piece of welding wire through the line and loosened the blockage and then ran brake clean and compressed air to clean it out. Reattached everything, bled the rear caliper and all is working as it should. Now, on to the next step in this restoration.

RAT
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Location: Toronto, Canada
Motorcycle: 1980 GL1100 Std
1977 GL1000s (2)

Re: bleeding the brakes 1983 1100

Postby RAT » Tue Jan 05, 2010 9:57 am

These old rubber lines can get blocked. They also break down, making your brake fliud black.

I replaced mine with Stainless, big improvement on the front.

Not sure I'd bother for the short length of the rear as long as you've got it working.

Gord

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WingAdmin
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1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: bleeding the brakes 1983 1100

Postby WingAdmin » Tue Jan 05, 2010 11:55 am

RAT wrote:These old rubber lines can get blocked. They also break down, making your brake fliud black.

I replaced mine with Stainless, big improvement on the front.

Not sure I'd bother for the short length of the rear as long as you've got it working.

Gord


I did stainless for front and rear, and really noticed a difference (my rear felt spongy before). However, on the 83, the rear runs both the front and rear brakes, so if you're going to replace one, you should do both, otherwise you really negate the benefit.

noelcassidy
Posts: 33
Joined: Mon Nov 16, 2009 7:43 pm
Location: walpole NH
Motorcycle: 1983 GL1100 aspencade

Re: bleeding the brakes 1983 1100

Postby noelcassidy » Tue Jan 05, 2010 5:28 pm

The rubber line on my 83 is no more then a foot long, it attaches to a steel line that then attaches to a splitter. The right front caliper is activated by the rear brake peddle, guess it is called a linked brake system. Sort of popular back in those days for the large touring bikes from the orient, then it was gotten away from, for what reason i don't know. Now, apparently, the manufacturers are producing machines with the linked brake system. I think if I were to go to stainless lines all i would need is the short one in the rear and the two front ones. Something to think about. I never owned a wing before so i am not sure if I will take to it. My current ride is a Moto Guzzi Norge sport tourer. The wing I picked up for $150.00. It was kind of rough as it sat for 10 years but I got it running well and decided to go right through it and make it look nice. That to me is called therapy.I am kind of interested to see how it goes down the road.




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