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You have to remove the hub to remove the brake dust shields. If you removed that already, then just pry at the shield. It's probably caked on, and needs a little elbow grease to get loose
It's much easier to just cut a small portion of the dust shield and then bend it a bit instead of removing the hub. Unless you already spent the money on the 350 shield
BTW: I've done my previous IS250 and a couple of friends and thats the way I've done it every time.
I ran into this problem when I was doing mine. It is impossible to remove the wheel bearing to install the dust shield without damaging it. I tried wd-40, prying it off, and yanking it out with the wheel back on. I eventually gave up and just trimmed the dust shields with a snip.
It's much easier to just cut a small portion of the dust shield and then bend it a bit instead of removing the hub. Unless you already spent the money on the 350 shield
BTW: I've done my previous IS250 and a couple of friends and thats the way I've done it every time.