How many miles are most people having their brakes checked/serviced? My car is making this weird noise that sounds like a warped rotor from the back passenger side but I haven't done any hard braking so that doesn't make any sense. Also, it's only under light acceleration (cruising in 5th for example) which makes zero sense to me. I don't know if it's a gear problem or a brake problem...I'm hoping it's a brake problem though 
