Thats what mine was doing too. For me it was handbrake pins, they broke and my ebrake squeaked. However if i reversed first, then drove, it wouldn t squeek. Basically the ebrake shoe fell off on my car, and made squeeking noises on vibration.
Check your bushngs too, bounce the car while parked, ebrake off, out of gear, see if it creaks, creaks= suspension, most likely bushings or springs, no noise= ebrake squeeking.