Clicking noise when braking
 

Hi guys,
Since 2-3 weeks ago i keep hearing a noise like a clicking (metal on metal). First i thought are some bushings/sway bar links... i checked everything and looks good. Today i figured that the noise is coming when pressing the brake (rear right)and not all the time, even when the car is parked. I cleaned up the drum, shoes but the noise is still there. Did someone had the same issue? Any advices on how to fix this?