classicxj2000

I've powerslot rotors up front with the recomended hawk pads. The drivers side has a rythmic squeek to it up to about 25mph. It will go away as soon as I touch the brake pedal. I hosed it down good with some brake clean: didn't change. I looked at the pad and there's a still a grove in the middle of it (I'm assuming this is the wear line). I guess the next step is to take the caliper off and take an in depth look. What should I be looking for?

thanks,
Dave