Yet another iABS Fault - K-Bikes.com - Excellence in Motion
 
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post #1 of 8 (permalink) Old May 4th, 2014, 6:19 am Thread Starter
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Yet another iABS Fault

Hi Guys,

It's been a while since I posted here but i desperatly need help from the iABS gurus (ABS III). I've read quite a bit about the problem here and other forums, but no luck.

Bike is k1200RS 2002 (iABS almost 100% sure)

Symptoms :

- gen warning on, abs flash at 4hz
- startup diagnostic runs fine
- rollout is normal, no fault
- no fault under light braking
- Medium or Hard braking or use of rear brake triggers fault code above
- Pull the front brake, abs pump whirls
- Press the rear brake lever, nothing

HIstory
- Fault codes appeared a while back (slow abs flash)
- bike was dropped right hand side (brake lever sides), foot lever seriously bent, hand lever broken off
- bent foot lever back in place, replaced hand lever, had to adjust because pump was staying always on.
- Just noticed something new this morning. After flushing front brake system, I moved on to rear and did not hear the pump come on when foot brake is depressed, it worked yesterday. Light smoke appeared (i KNOW )

What i have checked.
- Brand new battery, yuasa 51913 12v 19ah, fully charge, gives off 13.5v cold
- topped off fluid in both circuits
- rear brake light is OK
- Both lever switch checked.. OK
- Disconnected battery for an hour, reconnect, throttle reset
- Oil is really dark, black in the rear circuit


This does not look good.. The front circuit seems to operat normally, but the rear seems out of comission. Any thoughts?

Last edited by ragingBULL; May 4th, 2014 at 6:45 am.
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post #2 of 8 (permalink) Old May 4th, 2014, 7:36 am
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If you have black fluid I would get it to the dealer for a complete flush. You can not get a complete flush at home because the ABS portion of the servo unit holds fluid that can not be flushed out with out activation of the ABS pump while being serviced.
Have a complete line inspection also You can do a partial flush yourself but it is a pain in the ass and those brake systems are very sensitive.
The system is prone to failure even when they are properly serviced, in other words, THEY SUCK!..."Save a life" and let the dealer do the job and take on the liability
.If you have not experienced a brake failure yet on these bikes count yourself lucky, because when you do you will give a second thought of ever thinking of messing with BMW brake systems.
Without the proper tools (hand and diagnostic) and complete understanding of the electrical and hydraulic systems you are taking a BIG risk. There are a few "shade tree" wannabee mechanics / technicians that will try and talk you through this with pics and step by step instructions that seem like a proper way of doing things but often times they are not. Let a trained specialist that went to school for the job, do the job ESPECIALLY when it comes to ABS and servo assist brake systems.

Last edited by BAK04GT; May 4th, 2014 at 8:23 am.
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post #3 of 8 (permalink) Old May 4th, 2014, 8:53 am Thread Starter
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Yes, I understand what you mean, it can be a frightening/dangerous experience.

But i just don't have the money to bring it in.. Or at least, the bike is not worth it anymore. They will ask for the price of the bike to fix this issue. I know these guys, they're just gonna go on changing parts until it works.

So, I don't need the bike to commute, i can wait until i found the problem until I ride it again. But I would really rather find a way to fix myself to keep the cost to a minimum.
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post #4 of 8 (permalink) Old May 4th, 2014, 8:58 am
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Light smoke from where???

I won't talk you into a repair doesn't look possible as a DIY. But it looks like there are rebuilt modulators available in Germany (?). I'll be back a little later with a source for you to check.

Now....if the American rebuilder could just get to them iABS. He is not far from here and I have every intentions to have mine rebuilt preventively. But still they keep pushing back the date where they should be able to rebuild. By then should be winter here but looks like there are quite a few lined up before me. Maybe a good thing if mine stays healthy through the summer then they'll be.....experienced.

Benelli 50cc at 14
Yamaha RD 200 at 16
Yamaha RD 350 at 17
Honda CB 750 F at 18
Honda V45 Sabre at 24
BMW K100RS at 27
BMW R100GS at 34
BMW K1200RS at 53
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post #5 of 8 (permalink) Old May 4th, 2014, 9:02 am Thread Starter
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Quote:
Originally Posted by H96669
Light smoke from where???

I won't talk you into a repair doesn't look possible as a DIY. But it looks like there are rebuilt modulators available in Germany (?). I'll be back a little later with a source for you to check.

Now....if the American rebuilder could just get to them iABS. He is not far from here and I have every intentions to have mine rebuilt preventively. But still they keep pushing back the date where they should be able to rebuild. By then should be winter here but looks like there are quite a few lined up before me. Maybe a good thing if mine stays healthy through the summer then they'll be.....experienced.
Yeah I know, smoke is never good

I was kneeling down, intently pressing the rear pedal brake when I noticed some light smoke coming out the general area of the abs unit. Could be wires touching, a circuit frying, i don't know
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post #6 of 8 (permalink) Old May 4th, 2014, 9:09 am
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Quote:
Originally Posted by ragingBULL
Yeah I know, smoke is never good

I was kneeling down, intently pressing the rear pedal brake when I noticed some light smoke coming out the general area of the abs unit. Could be wires touching, a circuit frying, i don't know
I'll put it here.....went over there and of course the guy from Montreal beat me. Still too early in BC......

Makes me think the one of the motors is shorted out. Both should come on with the front lever. Using the rear brake only and only one motor comes on. You can maybe tell by sound alone. I can only do that sitting on my bike with the earplugs on or by hurting my ears with the stethoscope.

Benelli 50cc at 14
Yamaha RD 200 at 16
Yamaha RD 350 at 17
Honda CB 750 F at 18
Honda V45 Sabre at 24
BMW K100RS at 27
BMW R100GS at 34
BMW K1200RS at 53
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post #7 of 8 (permalink) Old May 4th, 2014, 9:12 am Thread Starter
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He hasn't found my problem yet

I have 0 motor or pumps coming on when using the rear brake, nothing happens... I seem to get normal response when using the front.

Now you tell me there are 2 motors in this unit??? One for each circuit? Really
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post #8 of 8 (permalink) Old May 4th, 2014, 9:18 am
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Quote:
Originally Posted by ragingBULL
Yes, I understand what you mean, it can be a frightening/dangerous experience.

But i just don't have the money to bring it in.. Or at least, the bike is not worth it anymore. They will ask for the price of the bike to fix this issue. I know these guys, they're just gonna go on changing parts until it works.

So, I don't need the bike to commute, i can wait until i found the problem until I ride it again. But I would really rather find a way to fix myself to keep the cost to a minimum.
Been there done that, but in the end it was worth the money for peace of mind.
When ever you buy a BMW bike you are more than likely never going to get any money out of it from resale or trade in, the "worth" is all in the ride and not the value of the bike itself unless you can trade in before warranty is up and stay within 30,000 miles over 3 years, you are going to lose in monetary worth.
I had a similar situation and tried the "shade tree" approach doing the job myself and all seemed fine for a while until that one day when a complete failure came from nowhere, with no warning at all luckily in a way it was not a "must stop" situation at normal travel speed but rather an approach to a toll both with no cars in front (toll booths and cars are hard when you hit them)....The next day I was happy to dish out the cash and had it dine the right way only because I loved the bike for what it was worth to me and not for what it was worth in a monetary sense
. It sucks all around but that's one of the downfalls of owning a BMW.

Last edited by BAK04GT; May 4th, 2014 at 9:24 am.
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