2011 Ford F450 Super Duty Crew Cab Owner Guide 4th Printing - Page 270

Driving Pull the release lever to release the parking brake. To prevent the pedal from releasing too quickly, place your left foot on the service brake pedal, then slowly pull the release lever until the pedal slowly releases. Make sure that the pedal is fully released. You may want to pull the release lever again to make sure the parking brake is fully released. WARNING: Always set the parking brake fully and make sure that the gearshift is securely latched in P (Park). If you're parking your vehicle on a grade or with a trailer, press and hold the brake pedal down, then set the parking brake. There may be a little vehicle movement as the parking brake sets to hold the vehicle's weight. This is normal and should be no reason for concern. If needed, press and hold the service brake pedal down, then try reapplying the parking brake. Chock the wheels if required. If the parking brake cannot hold the weight of the vehicle, the parking brake may need to be serviced or the vehicle may be overloaded. ENGINE ONLY TRACTION CONTROL (ALL DUAL REAR WHEEL (DRW) VEHICLES) This system helps you maintain the stability and steerability of your vehicle, especially on slippery road surfaces such as snow- or ice-covered roads and gravel roads. The system will allow your vehicle to make better use of available traction in these conditions. During traction control operation, the traction control light will illuminate and the engine will not "rev-up" when you press further on the accelerator. This is normal system behavior and should be no reason for concern. Also, if traction control is on when the vehicle is put into four-wheel drive mode (if equipped), the traction control system will be automatically disabled. Traction control operation will resume when the vehicle is placed back into two-wheel drive mode. 270 2011 F-250/350/450/550 (f23) Owners Guide, 4th Printing USA (fus)