I back out of a drive way or parking spot, stop, put it in drive and head forward. When I brake (only in Drive) it makes a poping/clunking/thud noise. It is in sync with my speed until I stop. It is loud with the windows up, quieter with the windows down, cant hear it with radio on or outside the car. Took it in and shop said brakes were fine, suspension looked great, bushings in good shape, and axles were fine. Any suggestions of what it could be?