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Recall campaign78V159000

Recall 78V159000: 1978 Harley-Davidson FLH and 1 other model

Service brakes, hydraulic › Foundation components › Master cylinder
Report received
Jul 19, 1978
Manufacturer
Harley-davidson motor co.
Potentially affected
342vehicles
Model years
1978

Check your own vehicle. A recall applies only to vehicles within the affected build range. Enter your VIN at nhtsa.gov/recalls. Recall repairs are free at a franchised dealer.

What NHTSA recorded

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.

Remedy

Dealer will inspect and, if necessary, replace the front brake master cylinder assembly at no cost to owner.

Affected model years

Pages for each model year show complaints, parts, mileage and other recalls.

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.