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ZBUM's 1984 Nissan 300ZX WebSite Some key points to keep in mind: SF models are all NAs and all of Canadian origin. 1984 and 1985 NAs and 1986 SF models are 4 lug. All other models/years are 5 lug. All year Z31 front brakes are vented. 1984-1986 rear brakes are solid. All others are vented. 1987-1989 front turbo brakes are dual piston style. All others are single piston.   # of Lugs Brake Type Rotor Diameter Minimum Thickness   front rear front rear front rear 1984-1986 SF (NA) 4 CL28VA CL14H 250 mm 258 mm 20 mm 9 mm 1984-1985 GL/GLL (NA) 4 CL28VB CL14HB 274 mm 290 mm 20 mm 9 mm 1986 GL/GLL (NA) 5 CL28VB CL14HB 274 mm 290 mm 20 mm 9 mm 1984-1986 GL/GLL (T) 5 CL28VB CL14HB 274 mm 290 mm 20 mm 9 mm 1987-1989 SF/GL/GLL (NA) 5 CL28VB CL14HVB 274 mm 282 mm 20 mm 18 mm 1987-1989 GL/GLL (T) 5 CL28VE CL14HVB 280 mm 282 mm 24 mm 18 mm