Service Brakes, Hydraulic, Foundation Components, Master Cylinder September 28, 1977 NHTSA recall 77V164000 385 units AN INCORRECT O-RING MAY HAVE BEEN INSTALLED IN THE REAR BRAKE MASTER CYLINDER. THIS COULD ALLOW AIR LEAKAGE INTO THE REAR BRAKE SYSTEM, POSSIBLY RESULTING IN LOSS OF REAR BRAKING EFFECTIVENESS. Full recall details: the risk and what to do →