The first time I apply the brakes after changing direction (from moving backwards to forwards, or vice versa) I hear a loud crunch sound from the right front wheel area. It can be a single "crunch" or several crunches in quick succession. Sometimes the sound also comes from the left front wheel, but usually just the right.
I've had a mechanic perform a visual check of the brakes and suspension and they found nothing obviously wrong.
Any ideas what it might be?