I'm getting an intermittent squeak from the rear passenger side brakes, and am at a loss to identify the cause. It can last for 10-15 minutes and mostly happens without braking. In fact, once it starts the only way I can get it to stop is by touching the brakes. I've noticed that it's worse when making a right turn and may start and stop if I hit a decent size bump (not positive about that). The rotor and pads are relatively new (about 6 months old - I installed them). I've tried tightening and loosening the parking brake actuator, but no affect. I'm wondering if it's caliper sticking. Thoughts?