ABS is only an additional feature. If it fails, the normal operation of the
brakes is not affected at all.
Very little is needed to disrupt the ABS and turn the warning light on.
Sensor failure and/or dirt is more than enough.
You can measure the sensors' resistance, to find out if they are OK. Not
sure what it should be

. The 605 (Bendix) allows adjustment of the ABS
sensor to the toothed ring on the driveshaft, but I do not know if the 406
is the same.
I can not see that changing the tyres would affect the ABS. The components
are sheltered and not in the way of tyre changing. The wires are held out of
harms way by clips.
If you find that you need a new ABS sensor, check eBay.
IPG
"gino" <barelli32.TakeThisOut@hotmail.com> wrote in message
news:41d07604$0$3129$cc9e4d1f@news.dial.pipex.com...
> Sorry for any confusion guys. It's the orange lamp with the skidding car
> diagram on it, like the skid hazard road sign. So it must be the ABS then.
>
> Am I right in saying that ALB is Anti-Lock Brakes and ABS is Anti-lock
> Braking System?
>
> If the above is true, what is the difference?
>
>
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