2009 Ford F150 Owner Guide 3rd Printing - Page 280

Driving • Heavy or uneven steering efforts may be caused by a low power steering fluid level. Check for a low power steering fluid level before seeking service by your authorized dealer. • Do not fill the power steering fluid reservoir above the MAX mark on the reservoir. If the power steering system breaks down (or if the engine is turned off), you can steer the vehicle manually, but it takes more effort. If the steering wanders or pulls, check for: • an improperly inflated tire • uneven tire wear • loose or worn suspension components • loose or worn steering components • improper steering alignment A high crown in the road or high crosswinds may also make the steering seem to wander/pull. LIMITED-SLIP AXLE (IF EQUIPPED) This axle provides added traction on slippery surfaces, particularly when one wheel is on a poor traction surface. Under normal conditions, the Limited-slip axle functions like a standard rear axle. The axle may exhibit a slight noise or vibration in tight turns with low vehicle speed. This is normal behavior and indicates the axle is working. Electronic locking differential (ELD) axle (if equipped) This axle provides added traction on slippery and/or off road surfaces, particularly when one wheel is on a poor traction surface. In normal driving conditions the rear axle function as a standard axle. The ELD may be locked or unlocked by the vehicle operator. Refer to Four-wheel drive (4WD) operation section in this chapter for further detail on ELD function and usage. When the axle is unlocked it will function like a standard rear axle. When the axle is locked it will not allow the rear wheels to rotate at different speeds when turning. The ELD axle is not recommended for use on good traction surfaces such as dry pavement. Doing so may result in abnormal driving behavior while cornering and excessive tire wear. 280 2009 F-150 (f12) Owners Guide (own2002), 3rd Printing USA (fus)