Hello, i have a 2008 DTS, did a front brake job, Rotors and Pads ( aftermarket parts) Now i have a very noticeable Humming noise when i apply the brakes, release and it goes away. so, thinking the pads that were too hard it was causing this, i replaced them, still humming, so, I thought i had a bad rotor and i replaced both rotors and still loud humming noise. its definitely rotational and only there when i apply the brakes. Also, all the slides and pistons feel good. im all out of thoughts on this one, please help. Thanks in advance.