>...You can also hear the noise while backing the car up
> after its been sitting a while. Could a brake pad be loose in the
> caliper causing the noise?
Not impossible. The previous loose rotor may have caused uneven wear on the
pads. May have also caused wear on the caliper slides. Its unlikely to be a
ball joint on a 2006. Either way, the caliper has to come off for inspection
of the pads. If the pads are worn more on the leading edge, replace the
pads. Inspect and lube the slides at the same time.
SD