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Re: Rotors...[900/1991] posted by Gene Stevens on
Wednesday, 24 January 2001, at 12:19 a.m.
Your '91 probably has ABS which does not use the 11.25" rotor (22MM thick). The original brakes on '91+ with ABS used the single piston Girling calipers and 11.00" x 26MM rotors. This is the set-up called "jumbo" front brake upgrade used to reduce the warpage problem on 1990 and earlier models.
Because the larger rotors had less problems, there's no powergroove replacement for them.