ABS error

[Filmcamera]

Ever since I changed the rotors and pads on my front brakes I have had this issue and cannot seem to fix it.


When I first ride the bike on any day the ABS lights stop flashing after a few feet like they are supposed too and I have no issues at all.  However if I make a stop and turn the engine off after riding for say 20 minutes when I restart my trip the ABS lights stay on. 


The only thing I can think of is heat in the brakes but I am not sure why that would cause an issue.


Any help would be great.


I also have huge pulsing when I brake but that is a separate issue which may be to do with torque pattern etc. the front wheel was just repainted so I am going to take the discs off and reattach them myself being careful to use torque the bolts a little at a time and using a criss cross pattern etc.

[johnny]

greetings...

it needs an exorcism like you...

j o

[Filmcamera]

Thanks for the help, always very welcome

[The Mighty Gryphon]

Have you checked the ABS codes when you have the ABS warning?

[Filmcamera]

No, since it happens when I am on the road I have not had a chance.  Next time I will test it as soon as I get home before turning the bike off etc.  I do know that only two codes reset when the bike is turned off and back on, one is the sensor gaps and the other low battery, my battery is pretty new (less than 2 years) and kept on a trickle charger  so I am hoping it is ok.

[bizzaro]

What Gryph said, and confirm you have a strong battery.  Give it a good charge and check it.  If the voltage is good, have go of it.  If it still faults after a run, check the voltage again,  and see if it is holding a charge on the road.  And a battery can have a bad cell, yet still read proper voltage.  Here in the states most auto parts stores can check this an will do so for free.  Not sure if you can find that in your neck o the woods?


Do they flash alternately before going to solid on?


You probably have this link, but in case you don't, here ya go.  Also make sure you are following instructions for ABS I at this site. For me, it is easy to get the two mixed up here as they are often interspersed!


http://bmwk10075abs1fix.web.fc2.com/

[The Mighty Gryphon]

I agree on having the battery load tested.  I have seen literally hundreds of batteries over the years that looked perfect just sitting there, but went almost to zero when they were connected to a load. 

There is also the issue of voltage recovery after having a high current drawn.  A good battery will recover quickly, but a weak battery will take a couple seconds.  That slow recovery is what could possibly be causing a low voltage fault in the ABS.

[Filmcamera]

The lights never flash alternatively and only go solid if I hit the reset button on the dash.1
I will get the battery checked, I really hope it is not that, they cost a fortune here - about $300... :dunno


I tried reading the fault codes but only have a digital multimeter so no luck.  I will either get an analog one or try and make up a LED bulb.


I also took the rotors off and ground back all the old paint and powdercoat on the wheel where the dscs install then retorqued everything in a criss cross pattern.  The result is that the pulsing is almost 100% gone, I just need the bobbins to loosen a little and i think it will be 100% gone.

[The Mighty Gryphon]

The easiest way is to get a 12v LED at the auto parts store.  They are pretty common now for pilot lights.  Add some wire and an alligator clip to make a ground connection and you're ready to go.  An LED also makes a great test light for injectors as well.

[Filmcamera]

I finally got ot the bottom of the issue.  Turns out it was as simple as a loose positive battery terminal.  As soon as I found it and tightened it up the ABS has been great ever since.  :riding:

[johnny]

battery and grounds... better put positivies in there too...