Brakes:hydraulic:master cylinder:housing
Defect Summary
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.
Corrective Action
Dealer will inspect and, if necessary, replace the front brake master cylinder assembly at no cost to owner.
Similar Recalls
Other recalls from Harley-davidson Motor Company or involving Service Brakes, Hydraulic.
FAQ: Recall 78V159000
Your rights, the repair process, and what each field on this page means.
What is recall 78V159000?
NHTSA recall 78V159000 was issued by Harley-davidson Motor Company on July 19, 1978. It addresses: Brakes:hydraulic:master cylinder:housing. The recall affects approximately 342 vehicles, with the defect involving the Service Brakes, Hydraulic component.
How do I get this recall repaired?
Contact any authorized Harley-davidson Motor Company dealer and reference NHTSA recall ID 78V159000 or the manufacturer campaign number NR (Not Reported). Under federal law, the repair is completely free regardless of vehicle age or owner history.
Is my vehicle included in this recall?
The only way to confirm is to look up your 17-character VIN at nhtsa.gov/recalls. NHTSA's tool will tell you if VIN-by-VIN this exact recall applies.
How long do I have to get a recall repair done?
There is no expiration on most federal safety recalls. Even if your vehicle is years old and you bought it used, the manufacturer is required to perform the repair at no cost.
Where does the data on this page come from?
All information on this page is sourced directly from the U.S. Department of Transportation public dataset for NHTSA recalls. Last refreshed: 2026-05-22. For the most current official notice, visit nhtsa.gov/recalls.