So yes the stock sti brembos are supposed to be loud but as of lately they are obnoxiously loud. I thought my stock pads needed to be replaced but they stiil have about 20% life left. I replaced them anyway with axxis ultimate's but they are still squealing. I even went back and put silicone brake lubricant on the metal plates contacting the pistons. It was quiet for about 20 minutes, but the squealing came back. I noticed a retainer clip missing on the front driver side caliper and 2 retainer clips missing from the driver side rear caliper. I ordered some new clips but I don't think that is causing the squealing. Btw the sound is heard under light braking. Under hard braking, no sound whatsoever. Any tips on what to do?