Sometimes brake noise gets absorbed and you can only hear the noise at certain times, even if they're shredded. It cant hurt to check the brakes and the bearings, as well as thoroughly inspect the steering and suspension, including bumstops and spring clash. Dont forget to check the rear... sometimes noise travels. I'm leaning towards body or suspension bushings myself, but without us hearing the noise, you pretty much just have to start inspecting.
Not really any efficient way of checking the P/S. If it doesn't make the same or similar noise when you load it, that's probably not it.
Look for any shiny spots too. It could even be tire rub due to a bad bushing somewhere.
