Ford 2009 F-550 v.1 Manuel d'utilisateur télécharger pdf (Page 305)

WARNING: If the parking brake is fully released, but the brake

warning lamp remains illuminated, the brakes may not be

working properly. See your authorized dealer.

4WD Systems

4WD (when you select a 4WD mode), uses all four wheels to power the

vehicle. This increases traction, enabling you to drive over terrain and

road conditions that a conventional two-wheel drive vehicle cannot.

Power is supplied to all four wheels through a transfer case. On 4WD

vehicles, the transfer case allows you to select 4WD when necessary.

Information on transfer case operation and shifting procedures can be

found in the Driving chapter. Information on transfer case maintenance

can be found in the Maintenance and Specifications chapter. You

should become thoroughly familiar with this information before you

operate your vehicle.

Normal characteristics

On some 4WD models, the initial shift from two-wheel drive to 4x4 while

the vehicle is moving can cause some momentary clunk and ratcheting

sounds. This is the front drivetrain coming up to speed and the

automatic locking hubs engaging and is not cause for concern.

Sand

When driving over sand, try to keep all four wheels on the most solid

area of the trail. Avoid reducing the tire pressures but shift to a lower

gear and drive steadily through the terrain. Apply the accelerator slowly

and avoid spinning the wheels.

Avoid excessive speed because vehicle momentum can work against you

and cause the vehicle to become stuck to the point that assistance may

be required from another vehicle. Remember, you may be able to back

out the way you came if you proceed with caution.

Note: If air is released from your tires, the Tire Pressure Monitoring

System (TPMS) indicator light may illuminate (if equipped).

2009 F-250/350/450/550 (f23)

Owners Guide, 1st Printing

USA (fus)

Driving

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Ford 2009 F-550 v.1 Manuel d'utilisateur Page 305