ABS - help needed

[max]

There are more ways than one to deal with this, the most aggressive being removing the electronic part and moving the pintels with a strong magnet in order to free it up, that is quite advanced but could be done.

Definitely worth trying the excersize way because of the non-invasive nature of the approach and something i would do first.
Assuming the abs has worked until recently so the stickyness should be minor.

Have you tested the front brake abs activity?

Since the pintels are pushed in position with a spring i would not try to tap the housing in an attempt to loosen them up .

This situation is actually the lesser of a faulty system, someone else reported that the brake actually failed to operate if i remember correctly.

It also seems that Honda's advice to basically flush the fluid and not worry about the abs modulator ( they don't provide instructions as far as i know but i could be wrong here ) is sometimes not sufficient to prevent a situation like yours.

Sorry if i overdo it with the instructions, you seem quite adequately familiar with bikes but it may help someone else if i tell the whole story; cheers

[The Gecko_imp]

@max, you ARE a genius !!!!
today went on wet grass (with care), again wheels blocked and ABS light comes on as before, rear and front, all the same.
tried a few more times - faster, heavier braking, no effect at all.
Found a different spot in the grass with a little more gravel visible and less dew visible. Tried the rear first, but no improvement.
Back to the front, speed up to 15 may be 20mph, heavy braking. Repeat ... only after 6th or 7th repetition I hear the ABS kick in on the front AND the light stays off. Try again, try the rear. The problem is gone.

If anybody has that problem and reads this thread, be careful ! You want boots on with very good traction and hold that handle bar straight. Otherwise your ABS test will end "where no man has ever wanted to go before".

Will watch if it stays like this over the next few rides. For now all I can say : Kisses to the moon and back to NZ !!!

[Nachodaddy]

Awesome! Max is the MAN! Great work Gecko and Max.

[max]

That makes me smile Gecko, thanks for your perseverance and a very complete description of what happened, i should have mentioned the straight line aspect of the excersize, thanks for emphasizing that.

Found it interesting that both wheels reverted to normal operation

So the question is; was the front wheel also affected by this fault??

Suspect some corrosion could be at play here so if it was me i would excersize the system some more and replace the fluid again and watching the fluid that comes out of the line closely to see if there is anything to indicate what happened.

Because of how the system operates the fluid inside the abs modulator does not get replaced but rather moved back and forth in the system and mixes in with the fresh fluid in the lines as the abs pulses so the more it pulses the more the fluid mixes and so replaces the old static modulator fluid.

Very nice outcome, and thanks for your much appreciated feedback

[GoldOxide_imp]

@max, you ARE a genius !!!!
today went on wet grass (with care), again wheels blocked and ABS light comes on as before, rear and front, all the same.
tried a few more times - faster, heavier braking, no effect at all.
Found a different spot in the grass with a little more gravel visible and less dew visible. Tried the rear first, but no improvement.
Back to the front, speed up to 15 may be 20mph, heavy braking. Repeat ... only after 6th or 7th repetition I hear the ABS kick in on the front AND the light stays off. Try again, try the rear. The problem is gone.

If anybody has that problem and reads this thread, be careful ! You want boots on with very good traction and hold that handle bar straight. Otherwise your ABS test will end "where no man has ever wanted to go before".

Will watch if it stays like this over the next few rides. For now all I can say : Kisses to the moon and back to NZ !!!

Congratulations Gecko!

[Cormanus]

Elegant diagnosis, Max. And bonus marks for perseverance, Gecko.

[the Ferret]

Nice work you two

[The Gecko_imp]

That makes me smile Gecko, thanks for your perseverance and a very complete description of what happened, i should have mentioned the straight line aspect of the excersize, thanks for emphasizing that.

Found it interesting that both wheels reverted to normal operation

So the question is; was the front wheel also affected by this fault??

Suspect some corrosion could be at play here so if it was me i would excersize the system some more and replace the fluid again and watching the fluid that comes out of the line closely to see if there is anything to indicate what happened.

Because of how the system operates the fluid inside the abs modulator does not get replaced but rather moved back and forth in the system and mixes in with the fresh fluid in the lines as the abs pulses so the more it pulses the more the fluid mixes and so replaces the old static modulator fluid.

Very nice outcome, and thanks for your much appreciated feedback

Now looking at the diagram again, this means Honda doesn’t use units which comply with that diagram. Since early abs models of the CB1100 had combined brakes ??? didn’t they .... could it be that Honda simply made a little change in 2014 which disabled that mode, but there is still some x-talk between front and rear ?

[Lord Popgun]

The 2013 models with C-ABS have different plumbing. It is the only model with C-ABS.

[max]

Once again a very clear explanation of what happened, i had an idea from your earlier post that the front was also affected but this cleared it up,.

Don't want to guess or interpret if i can help it and your explanation is excellent.

Ferret can explain this better than i can but i can't remember a combined braking system on our cb1100's.
( edit ) and thanks very much Lord Popgun for the clarification ).

The abs units have become smaller over the years but the working principle has always been the same and for the ones interested here is a 1,5 h long video of ZAM's channel, he completely takes an abs unit apart and explains ( in fluent German ) what happened inside when the unit from a 2006 cbf1000 with over 200.000 km and was removed in a working state but left disconnected for some years.




The electronic unit gets separated at 12 minutes, shows the pintel valves, the pump at 24 minutes and the pintels are operated at 1 h 12 minutes, i watched the entire video several times but i understand german well enough to grasp the very detailed explanation and have a lot of curiosity as well, he is about the best in explaining and repairing mostly Honda's and i have learned a great deal from his channel.

And so i am very grateful for all your precise input because we can all learn from it.

Thank you Gecko!