Hand control valve failure
Failure of the parking brake valve upper cam plate around the central boss may allow the parking brake to release and could result in the vehicle running away.
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Ce dossier rassemble les défauts connus de la Volvo F4, rédigés et sourcés par la communauté. La lecture est libre ; un compte gratuit permet de contribuer. Un défaut reçoit le sceau quand assez de contributeurs reconnus l’ont validé.
Failure of the parking brake valve upper cam plate around the central boss may allow the parking brake to release and could result in the vehicle running away.
A brake tube may break due to resonant vibration generated by operation of the vehicle. If tube breakage occurs, both front wheel and trailer brakes would remain functional, but the stopping distance would be increased.
On certain vehicles, the endstop for the secondary cab lock hook may experience abnormal wear. This can prevent the hook and latching bracket from engaging when the cab is powered.
Sources : NHTSA (États-Unis, domaine public), Transports Canada (Licence du gouvernement ouvert – Canada), DVSA (Royaume-Uni, Open Government Licence v3.0), RappelConso et Safety Gate de l'UE (France, Licence Ouverte 2.0).