Brake Master Cylinder. Brake Caliper. Brake Rotor. Brake Vacuum Pump. Power Brake Booster. Note-1: Drum Brake Wheel Cylinder -- Bore: 15/16 In. • 1976-1977 Buick Century -Rear Side, Bore: 15/16 In. • 1973-1975 Buick Century Wagon -Rear Side, Bore: 15/16 In.