Why are my brakes freezing on the rotors? 1986 GL1200. PLEASE HELP - Steve Saunders Goldwing Forums

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post #1 of 26 (permalink) Old 08-04-2019, 05:14 PM Thread Starter
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Why are my brakes freezing on the rotors? 1986 GL1200. PLEASE HELP

Hey guys, I need some serious help.

I'm working on a project, an 86 gl1200i, and I've done everything, timing belts, carb clean, fluids, oils, final drive, battery. She runs like a top, all carbs in sync, perfect idle, no issues, my only issues are, and the last thing...the brakes.

Both front calipers and the rear calipers when applied, the pistons don't come back in, and the brakes hold the rotors and have to be knocked off.

I bled the lines multiple time with fresh brake fluid, and blew air through the lines.

It gets good suction and good flow from what I can tell, but after doing a flush, the calipers still apply to the rotors and hold, they won't release.

I pulled the pistons on all 3 calipers, o rings, bleeder valve, theres barely any build up, theyre in great shape no visible rust etc.

I'm about to reassemble the calipers..but before I do that..and waste another 32 oz container of brake fluid flushing the brakes.....what on earth else should I check to get my brakes to work?

Decent life on the pads, good looking rotors, fresh fluid bled with no air, and they grab hold and down let go.

Please help me, I want to take this thing on her inaugural ride.

Thanks
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post #2 of 26 (permalink) Old 08-04-2019, 05:25 PM
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Did you check the "return hole" in the bottom of the master cylinders. If clogged, that will keep pressure applied to the calipers....!!

Some options are:

Pistons not moving freely.

Brake lines partly clogged up.

Return holes clogged up.
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post #3 of 26 (permalink) Old 08-04-2019, 05:27 PM
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The master cylinders have a very small fluid return port . That needs to be cleaned out so the pressure/fluid can return to the reservoir . If you look in bowl of the front master this hole is in the bottom. A single wire strand from a wire brush is is about size needed to clean this out. The rear master has the same type system I believe its where the fluid supply line connects to the master cylinder.
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post #4 of 26 (permalink) Old 08-04-2019, 05:41 PM Thread Starter
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Quote:
Originally Posted by OnaWingAndaPrayer View Post
The master cylinders have a very small fluid return port . That needs to be cleaned out so the pressure/fluid can return to the reservoir . If you look in bowl of the front master this hole is in the bottom. A single wire strand from a wire brush is is about size needed to clean this out. The rear master has the same type system I believe its where the fluid supply line connects to the master cylinder.
Heres the photos of the cylinders, where would they be?

Thanks
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post #5 of 26 (permalink) Old 08-04-2019, 06:07 PM
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The pic on the right under the metal tab.
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post #6 of 26 (permalink) Old 08-04-2019, 06:23 PM Thread Starter
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Okay I took the metal tab off and blew air through there but literally a strand of speaker wire wont fit through it.

How about the rear. The rear only has the one hole

Thanks
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post #7 of 26 (permalink) Old 08-04-2019, 06:50 PM
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If the small wire won't fit through (I use a high G string from a 12 string guitar set), then it is still plugged. You might have to pull the reservoir on the rear to get at the hole.
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post #8 of 26 (permalink) Old 08-04-2019, 06:54 PM Thread Starter
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Is the hole in the rear for the return in the reservoir or in the master cylinder
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post #9 of 26 (permalink) Old 08-04-2019, 07:12 PM
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The rear one is in the master cylinder . Where the reservoir hose attaches. Umm two screws hold the hose adapter ? its under there.
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post #10 of 26 (permalink) Old 08-04-2019, 07:15 PM
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I failed to ask in my first reply, are all three calipers locking up ? The rear and right front are both actuated by the rear master cylinder in the "Unified Brake System" . The front master only does the left front caliper.
Another thing.... when you had the calipers apart did you do a thorough cleaning of the seal grooves? Sometimes you need to take like a dental pick to really get the seal grooves clean .
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