The Brembos squeek at times. Its gonna happen. The only way to determine if your brakes are wearing down is to take your wheel off and look at your pads.
I have these Yellowstuff pads installed and theyre great. They still squeek sometimes (and for other readers, yes, I used the brake grease that goes on the back of the shims.)
Back on topic, if your pads still have meat left on them, take the pads out and grease up the shims, it will get rid of some of the vibration and noise. Its cheap too, maybe, $2.00 a pack at Advanced Auto or Autozone. They sell it at the register. Hope that helps.
06 GG Evo SE
I WANNA GO FAST