Ford Mustang

Hi I have a 2001 Mustang Gt 4.6 engine and disc brakes front and rear. Problem I have is brake squel, I have replaced all four rotors and pads and used new hardware but the noise is still there, did not change at all. What else could it be? Here is the past two weeks the noise is getting worse, I have even tried the brake queit stuff with no effect, please help.
March 19, 2007.

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