SECTION 9-C 1955 BUICK BRAKE SERVICE, ADJUSTMENT, REPAIR PROCEDURES 9-7 FILLING, BLEEDING, FLUSHING 1955 BUICK BRAKE HYDRAULIC SYSTEM Filling 1955 Buick Brake Master Cylinder The master cylinder must be kept properly filled to insure adequate reserve and prevent air from entering the hydraulic system. It must not be overfilled, however, as expansion due to heat absorbed [...]