SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:MASTER CYLINDER
Jul 19, 1978
342 units potentially affected
The defect: THE INVOLVED MOTORCYCLES WERE MANUFACTURED WITH FRONT BRAKE MASTER CYLINDERS IN WHICH THE PLUNGER PISTON BORE DIAMETER WAS HONED .015 INCHES OVER MAXIMUM SPECIFICATIONS. THIS OVERSIZED BORE RESULTS IN A POOR FIT BETWEEN THE ELASTOMERIC PISTON CUP AND THE CYLINDER BORE, WHICH ALLOWS FLUID LEAKAGE FROM THE HYDRAULIC SYSTEM.
The remedy: DEALER WILL INSPECT AND, IF NECESSARY, REPLACE THE FRONT BRAKE MASTER CYLINDER ASSEMBLY AT NO COST TO OWNER.
HARLEY-DAVIDSON MOTOR CO.View on NHTSA.gov