The "Boing" noise is in the Anti-Lock Braking System?

[Stephen Santoliquido]

Brett said:
> I would guess
> the sensor was accidentally bumped closer to the hub?

I would suspect the opposite. You replaced the axle right? You should have
pulled back the sensor at the start, and pushed it in at the end. You may
have a) forgoten to,push it back in, or not pushed it in firmly, or b) not
done anything with it in wich case you probably bumped it out when removing
the axle.
Either way, Brett's advice is solid. I didn't know about the ablative caps
when I did mine. Guess I was lucky ;~)
Steve