Please Help with GL1500I brakes '95


Information and questions on GL1500 Goldwings (1988-2000)
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Mosko
Posts: 7
Joined: Thu Oct 27, 2011 9:56 am
Location: Dalton, Georgia
Motorcycle: 1995 GL1500I

Please Help with GL1500I brakes '95

Postby Mosko » Sat Oct 29, 2011 4:17 pm



I have an older friend who has the GL1500I, and it's been sitting for a year or so. I have "some how" volunteered to help him get it running so he can sell it. The old boy is 79. I read many of the articles posted here in the past (very good site). We have it running after tank cleanup, seafoam, sparkplugs, etc.

The problem is the brakes. The wheels are "almost" locked up. When we moved it, the old boy pushed the rear brake pedal to stop it, and when the pedal was released the brakes continued to hold.

With the rear caliper off, the pads are good, but it seems that pressure was relieved, and the left front released also.

I read in one of the articles somewhere that there may likely be a fluid return hole or something that may be clogged.

Can some of you knowledgable guys point me in the right direction? If it requires removal of the rear master cylinder for cleaning or rebuilding, am I seeing it correctly, that the header and that common collector box, heat shields, and battery box etc must be removed to access the inner hydraulic line connection?

Thanks in advance!



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virgilmobile
Posts: 7646
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: Please Help with GL1500I brakes '95

Postby virgilmobile » Sat Oct 29, 2011 5:41 pm

All the master cylinders,front and rear,have a main fluid feed hole and about 3/16" in front of it is a verrrrrrry tiny bleeder hole.I had to use a single brissel from my wire wheel and 30 minute to get it cleared

Mosko
Posts: 7
Joined: Thu Oct 27, 2011 9:56 am
Location: Dalton, Georgia
Motorcycle: 1995 GL1500I

Re: Please Help with GL1500I brakes '95

Postby Mosko » Mon Oct 31, 2011 10:01 am

Thanks virgilmobile for the reply, I found the hole. As for getting the rear master cylinder off, I didn't get any help here, maybe none of you has ever had to remove a rear master cyl from a GL500I. Anyway, for those of you who may need to do such a thing...
1. remove all the lower farings and external heat shields from the right side.
2. remove the battery and the battery box.
3. remove both mufflers
4. remove the right side exhaust header
5. remove the common exhaust collector box
6. remove the internal heat shields around the master cylinder
7. disconnect the line from the resovior, and 2 brake lines from the Master cyl.
8. disconnect the linkage from the brake pedal
9. disconnect brake light switch
10. remove 2 X 10mm bolts to remove the master cylinder

When 1st looking at the task I thought it would take time and be a real problem. When finished, it had only required a bit less than 30 minutes. I did spray the exhaust system bolts with some "PBB" the day before, and had air tools in the shop for the work which did make it a bit faster.

Best Regards...

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virgilmobile
Posts: 7646
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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: Please Help with GL1500I brakes '95

Postby virgilmobile » Mon Oct 31, 2011 10:33 am

Was the tiny hole plugged?and did it fix the problem?
Inquiring minds want to know :D
Sorry I couldn't help about removing it.I don't own one ...YET

Mosko
Posts: 7
Joined: Thu Oct 27, 2011 9:56 am
Location: Dalton, Georgia
Motorcycle: 1995 GL1500I

Re: Please Help with GL1500I brakes '95

Postby Mosko » Mon Oct 31, 2011 4:01 pm

Was the tiny hole plugged?and did it fix the problem?
Inquiring minds want to know


I don't know yet, I have the master cyl off, but couldn't find my very small snapring plier. I thought about cleaning the hole and reinstalling it for a test, but I'm woried that whatever is in there, being in the interior will cause a problem later.

I'm a bit concerned because the fluid that drained out is completely clean, no sign of moisture, dirt or anything. The suction chamber and discharge chambers on the master cyl look as new, so it makes me wonder if the hole is plugged. As simple as the system is, and with the results of other tests that I performed, the problem is definitely caused by the fluid not returning and relieving pressure in the calipers.

One thing I did with the rear caliper off, was to press one then the other piston, and the fluid flows from one chanber to the other inside the caliper. Pressing both pistons simultaneously, clamps the left front, so the fluid "is" flowing out of the rear caliped. Also with pressure applied and the brakes locked up, when the line from the rear brake, at the master cylinder, was loosened, the fluid freely flowed and the brakes were released.

If all that wording makes any sense, the only thing I can see that could possibly be a problem is that after applying rear brakes, then releasing, the fluid will not return flow to the resevoir. With all that being said, if it's not the "hole" I can't imagine what it could be.

You sir are most correct when you said it "very small", quite inpossible to visually tell if it's plugged or not. When I get it apart, I'll punch out the hole, then flush it out into a cloth whereas anything in there can be seen.

I'll keep you updated.

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detdrbuzzard
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Re: Please Help with GL1500I brakes '95

Postby detdrbuzzard » Tue Nov 01, 2011 7:38 am

most bikes that have been sitting unused for that amount of time just have degraded brake fluid and maybe a piston that has rust on it
'99 ST1100, '93 se
'75 cb750k, '79 cb 750f, '79 cb750 superK
cb 450sc, sunL70
'06 st1300a
.... william

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virgilmobile
Posts: 7646
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: Please Help with GL1500I brakes '95

Postby virgilmobile » Tue Nov 01, 2011 9:10 am

In restoring my 83,I had to remove both master cylinders,disassemble and clear the port.It did stop the brakes from locking up but they still would drag a bit.I ended up removing all the calipers and scraping the groove that the seal sets in.It was full of crud.This also put a bind on the piston. There are "how to's" related to this work here.Its good info that applies to all braking systems.

Mosko
Posts: 7
Joined: Thu Oct 27, 2011 9:56 am
Location: Dalton, Georgia
Motorcycle: 1995 GL1500I

Re: Please Help with GL1500I brakes '95

Postby Mosko » Fri Nov 04, 2011 7:28 am

I finally had a chance to disassemble the master cyl, and the caliper. There is no rust or any "dirt" at all. However the small hole being discussed was plugged. The material found inside was an opaque gell type substance, probably a result of moisture.

I used "one strand" of a 14 AWG copper wire to clear the hole. My thinking there was that the soft copper wouldn't scar the internals of the cyl. Thereafter I sprayed out everything with brake parts cleaner and allowed to dry before reassembly.

The brakes work perfectly! I think probably the best thing to do would be to perform a similar service on the remaining hyd systems. But, as mentioned the bike is to be sold when in shape to do so. It's really a bit of a shame I suppose. It's been to the original dealer every 4,000 miles for service since it was new, now with 72,000, with all the service documented.

I didn't even install a new kit in the cyl, it looked good and as I said works great.

Best Regards... Mosko

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virgilmobile
Posts: 7646
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: Please Help with GL1500I brakes '95

Postby virgilmobile » Fri Nov 04, 2011 1:18 pm

Well it sounds like someone will get a good bike.Dalton is a bit far for me to go,otherwise I'd take it in a heartbeat.I'd have to sell one of mine first though.The misses said NO NO NO to a third bike yesterday.I found an older 1500 running for $2500, needs work.
Anybody wanna buy a 83?

Mosko
Posts: 7
Joined: Thu Oct 27, 2011 9:56 am
Location: Dalton, Georgia
Motorcycle: 1995 GL1500I

Re: Please Help with GL1500I brakes '95

Postby Mosko » Fri Nov 04, 2011 4:00 pm

Well it sounds like someone will get a good bike

You're certainly right about that. I've been looking at the service record in the owners manual. Everything possible has been done to this machine at regular intervals.

Best Regards... Mosko




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