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post #1 of 13 (permalink) Old 29th October 2014 Thread Starter
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Abs fault

Laguna 1.9 dci 05 plate
I have changed the nsf wheel bearing and now have a abs light on, everything has gone back as it came off.
Do i need to reset the computer to get rid of the light or will it just go off when i find and cure the problem.
I replaced the nsr caliper and bleed the brakes but the brake pedal now goes slowly to the floor there are no leaks.
Is there a sequence to bleeding the brakes as am putting another master cyl on as i think thats the problem.
Thank you
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post #2 of 13 (permalink) Old 29th October 2014
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Re: Abs fault

If the reluctor ring and it's sensor are in good nick then the ABS fault light should sort itself out.
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post #3 of 13 (permalink) Old 30th October 2014
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Re: Abs fault

Yes ABS light because it can't read the NSF speed sensor (toothed ring and electro-magnetic pick-up).

On the old Ford I had what tended to happen if a bearing failed was the toothed ring was allowed to move laterally and bash the sensor, either denting or shifting it, so when the bearing was fixed (and hub restored to correct position), the gap between ring and sensor is now too large. Or, sensor is damaged, but if you only noticed it after fixing the bearing one has to assume it was working up 'til then.

Re brakes, can only imagine there's still air in the pipes.

EDIT: you don't say whether ABS light comes on straightaway or after driving for a bit, if the former, sensor is open circuit (unplugged, dodgy connections or kaput); if the latter, it's not making a signal (gap too large, metal filings stuck to sensor).


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post #4 of 13 (permalink) Old 2nd November 2014
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Re: Abs fault

Who fitted & how was the bearing fitted?

The bearing has a thin magnetic ring incorporated into one of the seals, the bearing has to be handled and fitted extremely carefully and fitted delicately (No Hammers) or the magnetic strip can be broken...also the bearing has to be fitted the correct way around!

I'm guessing when you were bleeding the brakes after fitting the the new NSR caliper that you pushed the brake pedal right down to the floor....this can damage the seals in the master cylinder.....maybe this is your problem?

Diesel engined vehicles also suffer some brake creep...this is normal...



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post #5 of 13 (permalink) Old 2nd November 2014 Thread Starter
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Re: Abs fault

Thank you for replying.
My friend fitted the bearing and we used a press, as far as i know we fitted the bearing in the correct way round.
Which way does the rubber seal side fit??
We did the os one yest and the bearing came with the metal ring for the sensor.
The previous one didnt.!!!!!
Still have the brake pedal sinking slowly when pressed prob pressed pedal to floor.
using a machine to bleed next week so will replace master cyl as well.
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