Clutch and rear brake.


Information and questions on GL1200 Goldwings (1984-1987)
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Psycheonabike
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Clutch and rear brake.

Post by Psycheonabike »



Hey!

Bled the rear brake yesterday...took a while but no air i the end and started to feel and look like I was just pushing clean fluid through the breeder to tightened everything up and guess what....brake is more spongy now than before, which was the very reason leading me to bleed in the first place.

Oddly same story with the clutch. Bled clean and was much better with a cleaner shift withlittle clunk. Now it's a struggle to get it to go through the gears. Especially at lights having to let the clutch out a bit in order to change at all.

All advice welcomed as ever....looking forward to a time when I can offer more advice than ask so thanks for bearing with me on this journey guys!!! 🀘



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jaimenv
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Re: Clutch and rear brake.

Post by jaimenv »

Bleed the front right break, that took care of the same problem on mine.

If you have not over hauled the clutch master cylinder it's time to do so.
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Rednaxs60
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Re: Clutch and rear brake.

Post by Rednaxs60 »

You have linked brakes, right front and rear are linked. You bleed front first then the rear. Clutch is a challenge. Turn bars full to the right. May be air at top of line. Bleed at the banjo bolt of the clutch MC. Good luck.
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Psycheonabike
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Re: Clutch and rear brake.

Post by Psycheonabike »

Thanks again. All done...well bar taking her out of course. 😁

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WingAdmin
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Re: Clutch and rear brake.

Post by WingAdmin »

Use some bungee cords and tie the brake and clutch levers tight to the handlebars. Leave it like that overnight. I usually do this for all my bikes.

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oldishwinger
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Re: Clutch and rear brake.

Post by oldishwinger »

air in around the banjo bolt, at the master cylinders can be a devil to get out and no amount of conventional bleeding will seems to shift it. Ive had trouble with clutch, and front brake.

its messy be sure to cover tank and stuff but with clutch, I cracked the banjo bolt, and squeezed the lever held it in tightened the bolt, and released lever. did this several times until no air at banjo bolt, I took the bleeder completely out of the slave cylinder, and pumped the lever until only oil came out, then replaced the bleeder and bled it conventionally.

same thing with front brake, bled at banjo bolt first, then conventionally.

linked system doesnt give a lot options when air becomes an issue, can only bleed rear first and then front, hopefully this will clear it.

good luck

Psycheonabike
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Re: Clutch and rear brake.

Post by Psycheonabike »

Hmmm...one says rear first then front. Someone else says front first then rear.... πŸ™ƒ

I'll take her out tomorrow and see how she goes.

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Re: Clutch and rear brake.

Post by WingAdmin »

Psycheonabike wrote: ↑
Sun Mar 31, 2019 4:17 pm
Hmmm...one says rear first then front. Someone else says front first then rear.... πŸ™ƒ

I'll take her out tomorrow and see how she goes.
The GL1500 service manual says "front first then rear."

But the GL1200 service manual says the opposite:

Bleeding order
Bleeding order


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CrystalPistol
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Re: Clutch and rear brake.

Post by CrystalPistol »

WingAdmin wrote: ↑
Sun Mar 31, 2019 3:11 pm
Use some bungee cords and tie the brake and clutch levers tight to the handlebars. Leave it like that overnight. I usually do this for all my bikes.
Does this really work? I guess you mean weight or strap rear brake lever down? My 1200 rear brake has "gone limp" … dreading removing to do MC overhaul.
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Psycheonabike
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Re: Clutch and rear brake.

Post by Psycheonabike »

Aw well, just as well I did the rear first then πŸ‘

Is tackling the rear MC that tricky?

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WingAdmin
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Re: Clutch and rear brake.

Post by WingAdmin »

CrystalPistol wrote: ↑
Sun Mar 31, 2019 11:22 pm
WingAdmin wrote: ↑
Sun Mar 31, 2019 3:11 pm
Use some bungee cords and tie the brake and clutch levers tight to the handlebars. Leave it like that overnight. I usually do this for all my bikes.
Does this really work? I guess you mean weight or strap rear brake lever down? My 1200 rear brake has "gone limp" … dreading removing to do MC overhaul.
Yes, it's never failed for me. Not 100% sure why, but my educated guess is that there are air bubbles that are too large to migrate through some of the small ports in the brake system. By tying the levers down tight, you put immense pressure inside the hydraulic fluid. This compresses the air bubbles so that they are small enough to make their way up to the master cylinder, and the system "self bleeds."

That's my guess, anyway. For whatever reason though, anytime I've flushed fluid or opened a system, and I end up with soft brakes, doing this procedure overnight results in perfect, rock-hard brakes.

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CrystalPistol
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Re: Clutch and rear brake.

Post by CrystalPistol »

Gonna try it then .. thanks!
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CrystalPistol
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Re: Clutch and rear brake.

Post by CrystalPistol »

Well, never had before had issue, but as I had said, rear brake on my 1200 had gone soft over time sitting unused in basement (can't help it) and I checked front brakes and clutches of both the 1200 and 1500 trike as well as 1500 rear brake, all OK …. so I strapped rear brake pedal of 1200 down with three wraps of good bungie cord for 25 hours now, and pedal is good again, strong. I have been thinking this out, I think it maybe works as cup seals on piston maybe relaxed when not used for long time, maybe this reacquaints them with bore wall of MC.

I lean away from air bubble theory simply because I've never before had a soft pedal on this 1200 I've owned and ridden since 1995, so how would air get in there now? Not saying that's not it.

Anyway, it worked.

Thanks.
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Re: Clutch and rear brake.

Post by Ghostt »

Did you service the calipers at all?

Psycheonabike
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Re: Clutch and rear brake.

Post by Psycheonabike »

I did rear. Front seem fine...

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Re: Clutch and rear brake.

Post by Ghostt »

Psycheonabike wrote: ↑
Sun Apr 07, 2019 9:12 am
I did rear. Front seem fine...
might want to do the front as well, as is it's a linked system

Psycheonabike
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Re: Clutch and rear brake.

Post by Psycheonabike »

Ghostt wrote: ↑
Sun Apr 07, 2019 10:06 am
Psycheonabike wrote: ↑
Sun Apr 07, 2019 9:12 am
I did rear. Front seem fine...
might want to do the front as well, as is it's a linked system
...also on my list! πŸ‘

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Re: Clutch and rear brake.

Post by Ghostt »

Every time I change brake pads I always do a full service of the caliper, flush and fill with new brake fluid, etc..



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