If it's a generic kit- it's probably really really low end rotors, but still- grooves are not normal, but are not caused by defects. There's no defect that will cause that- it's usually rocks or crap mashed into the surface by the pads.
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2002 Freelander
2000 DII w/CDL
1967 SIIA 109SW
Former Rovers
2004 Modded "S" Disco, R.I.P.
2004 G4 Disco
2002 Modded Freelander
1995 Modded Disco
1994 D-90 #8
1993 NAS D110
1990 Range Rover County
1973 SIII 88
1972 Range Rover 2 door
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