Another possibility is the nut needs to be tightened properly. If the nuts too loose, the hub will shift when you make a turn and then the brake rotor will rub on the brake pads. (Same will happen with a worn out bearing)

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past MB rides:
'68 220D
'68 220D(another one)
'67 230
'84 SD
Current rides:
'06 Lexus RX330
'93 Ford F-250
'96 Corvette
'99 Polaris 700 RMK sled
2011 Polaris Assault
'86 Yamaha TT350(good 'ol thumper)