car makes flapping sound after new brakes and struts

my car has new Akebono brakes and new Monroe quick-fit front struts. I tried calling the mobile mechanic to ask why the car is making a flapping sound like a flat tire, when i turn right and accelerate. no answer from him. my brother checked the struts and found the strut bolts were loose and he had to tighten them. the flapping sound is there on the right side. also my brother noticed that the mechanic must of had trouble installing the struts because they looked like he really used a hammer to them. what could be causing the flapping? no flapping before!