GL1200 rear brakes


Information and questions on GL1200 Goldwings (1984-1987)
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eglerb
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Joined: Thu Apr 12, 2012 9:53 am
Location: Latrobe, Pennsylvania
Motorcycle: 1987 GL1200 Aspencage

GL1200 rear brakes

Postby eglerb » Thu May 03, 2012 6:03 am



Has anyone rebuilt the rear brake calipers seals, o-rings on a GL1200 Aspencade. I have bled the brakes but after sitting for awhile they don't work. Is this because of the calipers leaking? I don't see any brake fluid leaking anywhere.



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virgilmobile
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Re: GL1200 rear brakes

Postby virgilmobile » Thu May 03, 2012 7:41 am

I didn't "rebuild" mine but I've had them apart for cleaning.
When you say they don't work,can you describe what happens?
Like.....they work and then 3 days later the pedal goes all the way down?
They get mushy?
They seize up?
The fluid in the reserve is empty?
I have to bleed them every time?
A few more details can help.
The most common cause for non-working brakes after a repair is trapped air in the system.
On this wing,the back and one front caliper are tied together,so bleeding is ALWAYS done from the longest hose first(the front) and then the shortest last(rear).

eglerb
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Joined: Thu Apr 12, 2012 9:53 am
Location: Latrobe, Pennsylvania
Motorcycle: 1987 GL1200 Aspencage

Re: GL1200 rear brakes

Postby eglerb » Thu May 03, 2012 8:40 am

After a week or so the pedal goes all the way down. I have a 1987 Aspencade, the pedal only controls the rear brake. When I bleed it I get good braking but again after is sets for awhile I loose it.

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virgilmobile
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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: GL1200 rear brakes

Postby virgilmobile » Thu May 03, 2012 9:15 am

I really hope I'm not giving false information here,but I thought the gl1200 has combined rear and right front calipers as shown in the picture.My 1100,1200 and 1500 do.
You might test this by center standing the bike,turn the front wheel and depress the brake pedal.It should operate the front right caliper and the rear.
Unless the hydraulics have been altered,this should be true.
If it is,bleed the entire system,starting at the front caliper first then the rear.
Using a vacuum bleeder works the easiest for me by myself.

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WingAdmin
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Re: GL1200 rear brakes

Postby WingAdmin » Thu May 03, 2012 9:57 am

virgilmobile wrote:I really hope I'm not giving false information here,but I thought the gl1200 has combined rear and right front calipers as shown in the picture.


You're correct. Unless it's been modified, his GL1200 will have the linked braking system.

eglerb
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Location: Latrobe, Pennsylvania
Motorcycle: 1987 GL1200 Aspencage

Re: GL1200 rear brakes

Postby eglerb » Thu May 03, 2012 10:51 am

Thanks to everyone who replied. I didn't realize that the front right caliper was tied into the foot pedal also. I will check this out and bleed them both to see if this works. Thanks again.

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seabee_
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Re: GL1200 rear brakes

Postby seabee_ » Thu May 03, 2012 11:11 am

eglerb wrote:Thanks to everyone who replied. I didn't realize that the front right caliper was tied into the foot pedal also. I will check this out and bleed them both to see if this works. Thanks again.

You need to bleed the front brake first, then bleed the rear brake. A vacuum brake bleeder is not required to do this, but it does do a better and easier job of it.
Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic

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SilverDave
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Location: Langley, BC
Motorcycle: 1985 GL1200 GoldWing Aspy

Re: GL1200 rear brakes

Postby SilverDave » Thu May 03, 2012 2:29 pm

If you are using a MityVac on a 25 YO machine, just crack the bleed nipple, just a hair ...

If you, or PO have bled brakes several times, over those 2.5 decades, a Mity can sometimes suck air back past the screw threads .... Tiny bubbles appear ..... making it hard to judge if you have correctly sucked the fluid until its " clear " of bubbles.
The threads have become slightly worn, and do not fit the bleed screw exactly as tight as they used to, when new.


Three fixes :
a) Crack the bleed valve just a teeny tiny bit....
or
b) CAREFULLy wrap teflon tape around JUST the threads of the bleed screw..... no teflon in the brake fluid at all... just on the threads ...
or
c) Bleed with a Mity until you get a " string of tiny bubbles" ... which is the sucked back air ... and then finish up with a regular bleed device ... LOL... a clear jar, about two feet of clear tubing... and foot or hand pressure .... you know... the way we used to do it in the olden days....LOL

SilverDave

Vmaxbill
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Motorcycle: 1985 GL1200 Interstate

Re: GL1200 integrated brakes

Postby Vmaxbill » Fri May 17, 2013 12:29 am

5.16.2013

I have a question :-)

Since the GL1200 has integrated brakes IE: RF and Rear calipers, has anyone altered the system to have the rear brake pedal operate only the rear caliper and have the hand brake operate both front calipers. I really want more stopping power on the front with the hand brake. My Vmax is a heavy bike and both front calipers are operated with the hand brake. I am much more comfortable with this arrangement.

Thanks, Vmaxbill

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Wingman24
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Re: GL1200 rear brakes

Postby Wingman24 » Tue Jul 29, 2014 11:11 am

Vmaxx Bill.... Whats wrong with using both brakes (pedal and hand lever) at the same time as it should be done?? That should suffice stopping power..

I figure the only drwback of the lnked system would be around a corner or through sand or gravel. The times when you do not want to use the front brake at all...
Other than those situations, there is nothing wrong with the linked brake system..

:)

My problem is, the brake pedal goes all the way down without much stopping power at all.... I filled the master cyl. still same thing. Anyone got any ideas?? Or is it just blled them first before asking anything.....???
Be Safe - Live to Ride! Wing it through!

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HawkeyeGL1200
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Re: GL1200 rear brakes

Postby HawkeyeGL1200 » Tue Jul 29, 2014 2:52 pm

As I read the original post, I wondered if the condition of the master cylinder had been verified. The best bleeding job in the world won't help if the master is not working well.

It seems people struggle with these linked brakes, but I genuinely love mine. I find the bike is much easier to control at low speeds when I use the rear brake to stop and maneuver. I used to be a front brake leaner until I practiced stopping and steadying the bike with the rear/front linked system, and now that I'm used to it I don't know if I'd be happy to go back to riding the "old" way.
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

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SilverDave
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Re: GL1200 rear brakes

Postby SilverDave » Tue Jul 29, 2014 3:43 pm

I also really appreciate the linked system .. even though its a pain to bleed them ...

..... as I recall from reading about linked systems , the 40/60 ratio was carefully chosen by Honda engineers...
A regular front brake only application causes the nose to dive ( and lifts the tail, reducing traction on the rear quite a bit) ..
This is fine on a straight line panic stop... but not so good in the twisties.

With a linked system, assuming both tires are about equal... the entire bike " sinks " as you stop,
because of roughly equal braking forces on both wheels....
Its not a perfect balance , but its better than a front only application .

Maybe not as good as ABS, but pretty nifty for the mid 70's to 80's , IMHO .

SilverDave

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SilverDave
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Re: GL1200 rear brakes

Postby SilverDave » Tue Jul 29, 2014 4:03 pm

Really nice detailed analysis from MSG here :

http://www.msgroup.org/Tip.aspx?Num=082


SilverDave




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