I have brembo pads, don't have a squeak but have what i describe as a clunk when i reverse and then again when i move forward. I took it to the garage recently and they said that i had some play in the pads (one nissan dealer said they weren't genuine, the dealer i bought it from said they were genuine viewtopic.php?f=59&t=39627 ). The dealer i bought the car from showed me some genuine pads and i double checked online so they seam right. I just live with it for now and will swap them out soon, might try some ferrodo pads next time to see if they do the same.
when i asked the question it seamed to be a 50/50 split on 'it's normal' or 'it's not supposed to happen'