check the wheel bearing, check the pads to make sure the anti-rattle shim is on them, make sure none 0f the bolts on the caliper are loose. could also be an incorrect brake pedal or booster push rod setting.

dsm/mitsubishi service manuals https://www.mediafire.com/folder/5k14qlaulb9s1/dsm_mitsubishi

service manuals(my whole collection) https://www.mediafire.com/folder/ac51jwwa3g1n1/automotive_manuals