Changed brake fluids and now CBS wont work


Information and questions on GL1800 Goldwings (2001-2017)
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Heikki68
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Joined: Fri Aug 11, 2017 11:03 am
Location: Jarvenpää
Motorcycle: 2008 GL 1800

Changed brake fluids and now CBS wont work

Post by Heikki68 » Sun Jan 20, 2019 2:00 pm



Greetings from Finland!
Just changed brake fluids for my 2008 GL 1800. I have Haynes repair manual and the work went like in the movies, but noticed the CBS system won´t work. Here is -15 C and a lot of snow, so can´t testdrive the bike now. Anyone knows what I did wrong, some bleeding problem or ?



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baumedagn
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Re: Changed brake fluids and now CBS wont work

Post by baumedagn » Sun Jan 20, 2019 4:39 pm

Not sure what you mean "CBS" system. Do you mean ABS? And how do you know it's not working?

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Viking
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Re: Changed brake fluids and now CBS wont work

Post by Viking » Mon Jan 21, 2019 7:33 am

If you mean the ABS, and it is because the ABS light is illuminated on your dash panel, then not to worry. It illuminates for a while before you ride and use the brakes. Then it goes off.
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Heikki68
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Re: Changed brake fluids and now CBS wont work

Post by Heikki68 » Mon Jan 21, 2019 9:35 am

CBS is Honda´s combined braking system, which means simultaneous actuation of the front and rear brakes. When you use brake pedal, it will affect also front breaks and vice versa. This system is found at least some years VFR, CBR and Goldwing models. You can test it when your bike is on center stand and you squeeze front brake level and rotate the rear wheel, it will lock also lock rear wheel when system works it should be. This has nothing to do with ABS.

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823JIM
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Re: Changed brake fluids and now CBS wont work

Post by 823JIM » Mon Jan 21, 2019 10:50 am

I think you will find the bike needs to be moving or at least front wheel be rotating in the proper direction to have the left front caliper move upward when front brake applied to activate the secondary master cylinder on left fork leg to have it apply rear braking.



This is my understanding of how this works. Perhaps someone else on here has a more expert explanation or thought on this.
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Viking
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Re: Changed brake fluids and now CBS wont work

Post by Viking » Mon Jan 21, 2019 2:02 pm

Heikki68 wrote:
Mon Jan 21, 2019 9:35 am
CBS is Honda´s combined braking system, which means simultaneous actuation of the front and rear brakes. When you use brake pedal, it will affect also front breaks and vice versa. This system is found at least some years VFR, CBR and Goldwing models. You can test it when your bike is on center stand and you squeeze front brake level and rotate the rear wheel, it will lock also lock rear wheel when system works it should be. This has nothing to do with ABS.
Okay, sorry. I knew this as an LBS (linked braking system) so CBS did not bring it to mind. My fault not yours. So, are you sure the front brake locks the rear wheel as well, or is it only the rear brake pedal that activates rear and also front. Jim's diagram shows it this way.
It ain't about the destination - it's all about the journey

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Heikki68
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Joined: Fri Aug 11, 2017 11:03 am
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Motorcycle: 2008 GL 1800

Re: Changed brake fluids and now CBS wont work

Post by Heikki68 » Mon Jan 21, 2019 10:55 pm

Sorry for not explaining the matter well enough. I had Honda VFR some years ago and I think in that bike this system was called Dual brake system. Anyway thanks guys for your comments, I think I know the truth only when the bike season comes and I can drive properly instead of garage driving!

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cihilb
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Re: Changed brake fluids and now CBS wont work

Post by cihilb » Tue Jan 22, 2019 6:56 pm

I don't know if the Haynes manual has the proper sequence for bleeding the brake system. It needs to be followed though.

Front Brake Reservoir

1: Front Right Brake Upper Bleeder Valve 8mm

2: Front Left Brake Middle/lower Bleeder Valve 10mm

Rear Reservoir (under right side chrome)

1: Front Left Brake Upper Bleeder Valve 8mm

2: Front Right Brake Lower Bleeder Valve 10mm

3: Rear Brake Lower Bleeder Valve 8mm

4: Anti-Dive: bleeder valve on top 10mm

5: Rear Brake Upper Bleeder Valve 10mm



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