GL1200 Front Brake Calibers


Information and questions on GL1200 Goldwings (1984-1987)
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downhomr
Posts: 14
Joined: Sun Jun 27, 2010 11:11 pm
Location: Ajax, Canada
Motorcycle: 1985 Gl1200 Limited Edition

GL1200 Front Brake Calibers

Postby downhomr » Tue Mar 25, 2014 8:59 pm



Hello everyone...I have an '85 Limited Edition, that I'm about to rebuild the front brake calibers. The bike has 227,000 kms.
To my knowlwdge, this will be the first rebuild.
My question has to do with the bleed afterward...on the right caliber, which is linked to the rear brake.
If I use a hose pinch off clamp on the front caliber hose, minimizing fluid loss...do I still need to bleed the rear caliber??
Not that it's a big deal...just wondering if it's necessary or not.
Thank you very much.



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NebraskaHick
Posts: 16
Joined: Tue Mar 18, 2014 1:39 pm
Location: St. Libory, Nebraska
Motorcycle: 1983 GL1100 Aspencade
1988 GL1500 Project
Contact:

Re: GL1200 Front Brake Calibers

Postby NebraskaHick » Tue Mar 25, 2014 9:13 pm

Do NOT pinch off a brake hose; they are a high-pressure hose, and clamping it (especially one that old) could cause the layers to separate, leading to hose failure.

I found (on my 1100 and a 1200 that I worked on) the height of the line going up and over the fork to the front caliper does not let the rear caliper get any air into it. Thus, no need to do anything with the rear.

If you work on the rear master cylinder, that's another story.

downhomr
Posts: 14
Joined: Sun Jun 27, 2010 11:11 pm
Location: Ajax, Canada
Motorcycle: 1985 Gl1200 Limited Edition

Re: GL1200 Front Brake Calibers

Postby downhomr » Tue Mar 25, 2014 9:30 pm

Thank you for posting so quickly...I kinda thought I could get away with not needing to bleed the rear
caliber...and, thank you for the 'heads up' to not use the pinch off clamps.

User avatar
NebraskaHick
Posts: 16
Joined: Tue Mar 18, 2014 1:39 pm
Location: St. Libory, Nebraska
Motorcycle: 1983 GL1100 Aspencade
1988 GL1500 Project
Contact:

Re: GL1200 Front Brake Calibers

Postby NebraskaHick » Tue Mar 25, 2014 10:32 pm

No problem! I have had some interesting incidents concerning collapsed brake hoses. Had a customer with a Bronco, stuck caliper. Put new one on, came back next day, stuck caliper. Went to take the caliper off and it was VERY hot. Opened the bleed valve and almost got scalded from the HOT brake fluid.

Hmmmmmm. . . . Now WHAT would cause that much pressure in a caliper? The hose had collapsed and acted like a one-way valve: let fluid to the caliper, but not back into the master cylinder. Since it was trapped, as the brake got hotter, the fluid expanded, putting MORE pressure on the caliper, which created more heat, etc. etc.

Replaced the hose (and the cooked caliper & rotor!) and all was fine.




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