The National Highway Traffic Safety Administration said the investigation covers 430,000 motorcycles with model years from 2008 through 2011. The investigation stems from bikes with an anti-lock braking system, according to NHTSA.
Riders reported that the brakes on the hand lever and foot pedal did not work, causing one driver to crash into a garage door. Government regulators said they received 43 complaints, three reports of crashes and two reports of injuries.
Regulators said it is possible that some riders who experienced brake failure did not change the motorcycle's brake fluid every two years as recommended by Milwaukee-based Harley-Davidson Inc.
Harley-Davidson motorcycles roll through an automated assembly line
The investigation is not a motorcycle product safety recall. Harley-Davidson said it is aware of the investigation and is cooperating with regulators.
Harley-Davidson said it is cooperating with regulators in a National Highway Traffic Safety Administration investigation into complaints by owners who say their motorcycle brakes failed without warning.