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post #13 of (permalink) Old 30th October 2012 Thread Starter
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Re: Laguna 2 NSF wheel bearing replaced now ABS fault ?

Hi voxmagna,

Very interesting thoughts there.

I don't think that by running the hubs & then stalling the engine like you did would have caused any problems.
I know ABS systems are designed to reset themselves, if you jack just the drivers side front wheel from the ground then put the car in gear the drivers wheel will spin, this will put on the ABS light, however when the car is driven normally the system will reset itself after a short distance (Speed) and all will be well.
There also must be some tolerance in the system as when you go around a right hand bend (Roundabout) the left hand wheels on the car are turning more than the right hand side wheels.

Maybe if the magnetic pulses from the new bearing (s) are a slightly different pattern than the ones that the computer is used to it will store a fault, maybe the system just needs to be reset to "learn" the new sequence of pulses!
The point you make about the ABS computer possibly storing a fault is interesting, you could be onto something.

I haven't got round to getting a 2nd hand hub from the scrappy yet as I'm full of cold so haven't felt up to crawling around under cars.

When I changed the bearing the ABS light didn't come on straight away, I had drove the car about 5 miles before it came on which seems strange as you would think if there was a problem it would be apparent straight away. I also can't understand how the speedo is working fine if the pulses from the bearing are wrong?

I had a very similar thing happen when I replaced the rear discs on my car just over a year ago. The replacement discs came complete with bearings & ABS ring so it was just a case of old discs off new one's on.
With the new discs fitted all was well....until I drove the car approx 5 miles then the ABS light came on...can you spot the pattern emerging!

Now at the time I was having problems with my ABS light that was coming on intermittently so I just thought it was part of that far a I can remember after the rear disc change the ABS remained on until I changed the dashpod (clocks) on the car due to the processor not working in the cold weather (Yes I've had all of the nice easy to suss out problems ) anyway I'm sure that when the 2nd hand clocks went in the ABS light went off (They still illuminated as they should when starting the car) and I then thought that it was maybe the dodgy processor of the clocks that had been causing the problems with the ABS lights.....

That was until I decided to try out the ABS system to see if it was actually wasn't...I could get the car to skid with no signs of the ABS working when I stood on the brakes, however I had no ABS warning lights lit up...that's when I started THIS THREAD

As you will see from reading the thread in the link changing the ABS pump cured the problems and all was warning lights and the ABS was working fine.

Now thinking about it on both occasions when I have changed a magnetic ring on the brakes it has caused the ABS light to come on after about 5 miles of driving ...a bit of a coincidence or what?
I wonder if the light comes on once a certain speed is reached rather than distance!

I wonder if the system becomes confused because the magnetic pulses are slightly different to the ones it had from the old magnetic rings so throws up a fault that needs to be reset !


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