are they new pads thats made the noise from fitting or old that just developed the noise,if new i would say their not bedding in to the disk right,are the disks in good nick,buy another set cheap pads and see if their same,if no noise then you was unlucky and got a set bad pads,risk you take with cheap pads,i use to use cheap pad all time in my blob,allways work't great but 1 set i got i had to take back as little bits had chip't off the leading edge when i took them out the box.