brake fluid return port


Information and questions on GL1100 Goldwings (1980-1983)
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glasshead
Posts: 139
Joined: Sun Jun 13, 2010 10:30 am
Location: Lexington, KY
Motorcycle: 1983 Goldwing Interstate

brake fluid return port

Postby glasshead » Sun Oct 03, 2010 8:51 pm



I am sitting here with my front master brake cylinder in front of me. The rebuild kit isn't due in for 3 days. I was just going over the 'how to' lesson again and was trying to find the brake fluid return port mentioned in the 'how to' post. I don't see any pinhole. There is a rather large hole horizontally opposite the main port that seems to have what looks like a ball bearing, but when I poked it gently, it looks like it is made of rubber. Maybe it is a ball bearing that is floating on a spring???
Does the plastic box come off the housing? It sure would be easier to see in there.? Does all of this sound typical :?:

rich



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virgilmobile
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Re: brake fluid return port

Postby virgilmobile » Sun Oct 03, 2010 9:23 pm

Don't know exactly what you are seeing,but.....my front master cyl would not bleed off the brake pressure and the front brake would lock up.I removed the plastic fluid bowl(wiggle,jiggle and pried).I found the large hole OK and the small hole rusted shut.I had to use a magnifying glass just to see where it was(about3/8" in front of the large hole)It is verrrry small.I used the wire from the bottom of a plug in marker light to clear it open,again with the wiggle jiggle method.the wire is smaller than a bread tie,and stiffer.

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glasshead
Posts: 139
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Location: Lexington, KY
Motorcycle: 1983 Goldwing Interstate

Re: brake fluid return port

Postby glasshead » Sun Oct 03, 2010 9:41 pm

Thanx virgilmobile. I didn't see any reason the plastic bowl wouldn't come off, but sometimes you just don't know. I will wiggle it off and find that hole.
thanx for the fast reply.

rich

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glasshead
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Location: Lexington, KY
Motorcycle: 1983 Goldwing Interstate

Re: brake fluid return port

Postby glasshead » Mon Oct 04, 2010 7:13 pm

I got the plastic cup off. What I thought was a ballbearing or something was actually a drop of brake fluid floating in the recess where that tiny teeny little hole is. I soaked the whole thing in vinegar and baking soda over night. Then when I got home I woked on it with some amazingly little wire. I even got the smallest needle my wife had in the drawer. That actuall punched through to the inside of the cylinder. But then the end broke off. I was able to push it back out from inside the cylinder. I am ready to go as soon as the kit comes in.
It's hard to believe that such a tiny thing like that hole can be responsible for stopping a 400 lb motorcycle on its own.
Wouldn't have even known to try cleaning it out without all your help.
rich

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virgilmobile
Posts: 7653
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: brake fluid return port

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

My wing weighs in at around 850.within 1 mile it ground to a halt with the front rotor smoking.I had to bleed the line to get home.Weird feeling to set beside a 4 lane and you can't even push it off the road.But all is well now,i have cleaned the entire brake system,Good to go.

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WingAdmin
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Re: brake fluid return port

Postby WingAdmin » Mon Oct 04, 2010 7:27 pm

I searched around trying to find a strong, stiff wire the correct diameter. I ended up using a single bristle clipped off of a wire brush that I had laying around.

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glasshead
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Location: Lexington, KY
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Re: brake fluid return port

Postby glasshead » Tue Oct 05, 2010 4:56 pm

It is crazy enough that the hole is that small, (does it need to be that small?), but it is at the bottom of a recessed 'pool' just primed to collect any and all gunk that ends up in the fluid cup. GO FIGURE :roll:
Is there anything I should do as a preventative measure before putting it all back together?

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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: brake fluid return port

Postby WingAdmin » Tue Oct 05, 2010 8:00 pm

glasshead wrote:It is crazy enough that the hole is that small, (does it need to be that small?), but it is at the bottom of a recessed 'pool' just primed to collect any and all gunk that ends up in the fluid cup. GO FIGURE :roll:
Is there anything I should do as a preventative measure before putting it all back together?


Resolve to flush your brake fluid every couple of years. :) That's really the only thing I can think of that will prevent it.




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