Steering: hydraulic power assist system
- Component
- Steering: hydraulic power assist system
- Manufacturer
- FREIGHTLINER CORPORATION
- Vehicles affected
- 422
- Reported to NHTSA
- 1999-09-20
- Owners notified
- 2000-05-26
Defect description
THESE VEHICLES HAVE DUAL AXLE STEERING WITH A HYDRAULIC VALVE WHICH DIVERTS POWER ASSIST FROM ONE SIDE TO THE OTHER AS NECESSARY. THE HYDRAULIC VALVE CAN BE CONTAMINATED CAUSING THE VALVE TO MALFUNCTION.
Safety risk
IF THE VALVE FAILS, THE DRIVER WILL EXPERIENCE A LOSS OF POWER STEERING ASSIST OR THE INABILITY TO SWITCH POWER STEERING ASSIST FROM ONE SIDE TO THE OTHER. THIS WILL INHIBIT THE DRIVER'S ABILITY TO CONTROL THE VEHICLE.
Manufacturer remedy
DEALERS WILL INSPECT THE STEERING CONTROL VALVE AND PARKING BRAKE INTERLOCK FOR PROPER OPERATION. CONTAMINATED OR MALFUNCTIONING UNITS WILL BE REPLACED.