Ok guys i did a full check today i found the sound. it was from my absorber spring.
all of this is due to the vibration of bad mounting. causing things to nuts on the absorber to rattle, spring was slidely displace.
solution: my mechanic turn the spring to its original posiition (matching the brakets). tighten all the screws on the absorber. put grease on the contact point between the spring and lower braket. sound is gone when u place everything back.