Why are my brakes freezing on the rotors? 1986 GL1200. PLEASE HELP - Page 2 - Steve Saunders Goldwing Forums

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post #11 of 26 (permalink) Old 08-04-2019, 07:32 PM Thread Starter
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Location: Virginia Beach, VA
Year: 1986
Model: GL1200 Interstate
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Quote:
Originally Posted by OnaWingAndaPrayer View Post
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 .
I have the calipers right now, I polished everything nice and clean and pulled the rings to clean the seal grooves, i did have to use picks to get all the dried gunk out.

I can't tell you if the front right does (which I know is activated by the rear brake), but the front left brake (front) and rear caliper, both do it. So yes, essentially all 3 lock up.

So to clean the return on the rear, I have to pull the master cylinder off I guess, which is below that res.

I don't think the caliper seals or pistons where the issue, as they were already pretty clean inside, however I gave them a brass brush scrub with brake cleaner.
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post #12 of 26 (permalink) Old 08-05-2019, 06:23 AM
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You could briefly loosen the bleeder screws on the front two calipers to see if the brakes release or not. This would confirm calipers OK and master cylinder return hole is plugged.

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post #13 of 26 (permalink) Old 08-05-2019, 08:23 AM
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Check that the brake pedal pivots freely and returns to the proper height to foot peg and the MC push rod length is correct per the "specs" in the manual. Remove the metal deflector cover inside the front MC and see if it squirts fluid/bubbles through the hole while squeezing the lever and if it does, the port is open. Jack the front tire off the ground while trouble shooting the left rotor so you can spin it. Smack the caliper side with a rubber mallet if the pistons stick or open bleeder if that releases them ?

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post #14 of 26 (permalink) Old 08-05-2019, 11:09 AM
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For what it's worth the return hole is also the feed hole.
In other words if you can pump fluid through the system the hole ain't plugged.

Advise given here is free and comes with no warranty "Caveat emptor"

Ken.
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post #15 of 26 (permalink) Old 08-05-2019, 04:28 PM
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Caliper piston is usually the problem. I had to make a scraper tool out of an old spoke. Bent and Flattened the end. Ground it to the right shape to reach every part of the seals groove. It has to be cleaned of all gunk or the o ring will be too tight.

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post #16 of 26 (permalink) Old 08-05-2019, 09:30 PM
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Quote:
Originally Posted by Xpistos View Post
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.
On a 1200, the Lt frt is on the handle bar right side hand control master
...the Rt frt is operated by the rear foot operated master cylinder, the systems are totally separate. There is no way for a single plugged port or other malady to cause all three to fail to release, other than operator holding all applied.
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post #17 of 26 (permalink) Old 08-08-2019, 06:31 PM
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Year: 1986
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I had that problem with the back brakes on my GL1200i and I just put some oil on the outside of the pistons so they would slide smoothly and have not had the problem again..
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post #18 of 26 (permalink) Old 08-08-2019, 06:38 PM
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Port

The port everyone is talking about is called the compensation port. Although there are other names I have heard it called as well. I have had that problem on my 78 and it takes a very very small wire to clean it out.

Bill
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post #19 of 26 (permalink) Old 08-08-2019, 07:18 PM
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Personally, I once had an issue like yours on an old car. Turned out to be that the inner hose lining had separated and would only allow the fluid to flow out to the caliper, but not back in to release pressure. I could drain fluid out through the bleeder, but not add fluid back through the same bleeder, or through the caliper end of the hose.
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post #20 of 26 (permalink) Old 08-08-2019, 09:06 PM
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I just cleaned my rear MC on the '79 tonight. The "compensation" port (separate from the feed port) is behind a separate plug on the MC. Remove it (14mm head) and look straight in, you will see a ~2mm depression - the hole is in the bottom of it. I had to clean mine out with a 12-string guitar high G in a pin vise. Then I flushed it well with brake cleaner.

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