Drum Brake Wheel Cylinder. 1988-1989 Buick Century Bore: 11/16 In.; w/RPO Code JA1 (Light Duty Brakes); Position: Rear;. 1990-1992 Buick Century Body: Coupe; Bore: 11/16 In.; Position: Rear;. 1990-1992 Buick Century Body: Sedan; Bore: 11/16 In.; Position: Rear;.
