Rattling under front driver's side when breaking and turning under pedals/front end

Hi this is Dusty, I'm one of the auto experts on RepairPal's Car Genius team! It sounds like a frustrating situation! The symptoms you are experiencing leads me to believe that the control arm bushings have failed, most likely the rearward bushing. The noise you're hearing is the arm making contact with the bolt that secures the control arm to the subframe, or the arm contacting the subframe itself, which is very close to where you described hearing the results of the failure. I'd recommend having a competent professional evaluate the vehicle, when suspension components like control arms fail, it can affect your vehicle's stability and ability to brake properly. If you have any other questions or would like to help with finding a RepairPal Certified shop in your area, give us a call! 877-913-1554