I'm so happy
I was able to find out where the rattling was coming from. Its coming from the passenger front dust shield behind the rotor. The dust shield taps against the rotor and caused the chatter. Can anyone tell me in which part of the service manual I can find how this dust shield is held on? I'm thinking either it got bent somehow or it lost a screw that was holding it in place. It's hard for me to tell since I did the inspection with the car on the ground.