I'd check your rear pads. I recently had the same issue and new it was time to replace (around 45k). After inspection of the old pads, I found the rears had deteriorated much faster than the fronts. Check them soon, and you MAY avoid having to turn the rotors (or worse, replacing them (which, of course would call for an up grade

)).
Good luck
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'06 V6 Mustang, Flowmaster AT single axle back, 20" bullitt wheels, tinted windows
Work in progress!!!
I no longer speed, but do go from 0-60 as fast as she'll let me ;)