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jack your wheel up until its of teh ground. Grab the tire from the top and from the bottom. shake it back and forth and if you have alot of play when you wiggle it around or if u hear clicking or metal to metal noises yes probably.
could be your shoes too. I had that on my mazda after every brake job, if it got a lil wet around there, then id have these lines of dust, they were actual lines of dust, driven out by cintrifical force. but never had any issues....