Re: Front wheel squeaks when going over a bump.
I also get this noise.
My suspension has been checked out, and is okay.
However, I noticed that when starting journey very squeaky, and settles down after a while. Then experimented pumped the brakes like crazy, almost cures the squeaking. There are some springs on the callipers which get loose still work fine, just loose enough to cause some squeaking. A cheap and easy fix from any Alfa specialist if you share the same ailment.
As regards WD40 dont do it. If you trace it to the bushes, use silicone based spray your local motor store will be able to advise. There is a good Teflon coated based silicone which works a treat.