FORD SUPER DUTY 2023 Owners Manual

SWITCHING THE ELECTRONIC
LOCKING DIFFERENTIAL ON
AND OFF - 4X2
Press the electronic locking differentialswitch to engage and disengage theelectronic locking differential.
4X2 Rear Electronic LockingDifferential Engagement Speed andAvailability
AutomaticRe-Engage-ment Speed
AutomaticDisengage-ment Speed
MaximumEngagementSpeed
20 mph(30 km/h)25 mph(41 km/h)20 mph(30 km/h)
Note:The electronic locking differential canactivate or deactivate automatically basedon speed, four-wheel drive mode, and drivemode selection. See Selecting a DriveMode (page 311).
Note:The electronic locking differentialmay not engage if you press the acceleratorpedal during an engagement attempt. Amessage could display in the instrumentcluster display guiding you to release theaccelerator pedal.
Note:Switching the electronic lockingdifferential off while turning results indisengagement difficulties. If the electroniclocking differential has difficultydisengaging, release the accelerator pedaland turn the steering wheel back and forthin small increments while maintainingcontrol and following a straight line.
Note:The electronic locking differential isfor off-road use only and is not for use ondry pavement. Using the electronic lockingdifferential on dry pavement results inincreased tire wear, noise and vibration.
Note: Do not perform this operation whencruise control or trail control is selected andactive. The system may not engage ordisengage as expected.
ELECTRONIC LOCKING
DIFFERENTIAL INDICATORS
If both rear wheel axle shaftslock together, the indicator in thecluster is amber, providingadditional traction.
If you select the electronic lockingdifferential and the indicator in the clusteris gray or turns from amber to gray whiledriving, one of the following has occurred:
•The vehicle speed is too high.
•The accelerator pedal is too high duringan engagement attempt.
•The vehicle is experiencing an anti-lockbrake activation.
•The left and right wheel speeddifference is too high during anengagement attempt.
If you select the electronic lockingdifferential and the indicator in the clusterdoes not turn on, the following hasoccurred:
247
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMElectronic Locking Differential (If Equipped)E373432 E325779

•The system has malfunctioned andaccompanies a check lockingdifferential message in the informationdisplay. See your dealer as soon aspossible.
Note:If the vehicle is experiencing ananti-lock braking event, the electroniclocking differential may momentarilydisengage.
ELECTRONIC LOCKING DIFFERENTIAL – TROUBLESHOOTING
ELECTRONIC LOCKING DIFFERENTIAL – INFORMATION MESSAGES
Description and ActionMessage
An electronic locking differential system fault is present.Contact an authorized dealer as soon as possible.Check Locking Differen-tial
Release the accelerator pedal to engage.To Engage LockingDifferential ReleaseAccelerator Pedal
248
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMElectronic Locking Differential (If Equipped)

BRAKE PRECAUTIONS
Wet brakes result in reduced brakingefficiency. Gently press the brake pedal afew times when leaving a car wash ordriving from standing water to dry thebrakes.
Note:Depending on applicable laws andregulations in the country where your vehiclewas originally built, the stoplamps couldflash during heavy braking. The hazardwarning flashers could also turn on whenyour vehicle comes to a stop.
ANTI-LOCK BRAKING SYSTEM
ANTI-LOCK BRAKING SYSTEMLIMITATIONS
The anti-lock braking system does noteliminate the risk of crash when:
•You drive too closely to the vehicle infront of you.
•Your vehicle is hydroplaning.
•You take corners too fast.
•The road surface is poor.
Note: If the system activates, the brakepedal could pulse and travel further.Maintain pressure on the brake pedal.
BRAKE OVER ACCELERATOR
In the event the accelerator pedalbecomes stuck or entrapped, apply steadyand firm pressure to the brake pedal toslow the vehicle and reduce engine power.If you experience this condition, apply thebrakes and bring your vehicle to a safestop. Move the transmission to park (P),switch the engine off and apply the parkingbrake. Inspect the accelerator pedal forany interference. If none are found and thecondition persists, have your vehicle towedto the nearest authorized dealer.
LOCATING THE BRAKE FLUID
RESERVOIR
See Under Hood Overview (page 441).
CHECKING THE BRAKE FLUID
WARNING: Do not use any fluidother than the recommended brake fluidas this will reduce brake efficiency. Useof incorrect fluid could result in the lossof vehicle control, serious personal injuryor death.
WARNING: Only use brake fluidfrom a sealed container. Contaminationwith dirt, water, petroleum products orother materials may result in brakesystem damage or failure. Failure toadhere to this warning could result in theloss of vehicle control, serious personalinjury or death.
WARNING: Do not allow the fluidto touch your skin or eyes. If thishappens, rinse the affected areasimmediately with plenty of water andcontact your physician.
WARNING: The brake systemcould be affected if the brake fluid levelis below the MIN mark or above the MAXmark on the brake fluid reservoir.
249
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMBrakes

1.Park your vehicle on a level surface.
2.Look at the brake fluid reservoir to seewhere the brake fluid level is relativeto the MIN and the MAX marks on thereservoir.
Note:To avoid fluid contamination, thereservoir cap must remain in place and fullytight, unless you are adding fluid.
Only use fluid that meets ourspecifications. See Capacities andSpecifications (page 520).
BRAKE FLUID SPECIFICATION
See Brake Fluid Specification (page 539).
BRAKES –
TROUBLESHOOTING
BRAKES – WARNING LAMPS
WARNING: Driving your vehiclewith the warning lamp on is dangerous.A significant decrease in brakingperformance may occur. It may take youlonger to stop your vehicle. Have yourvehicle checked as soon as possible.Driving extended distances with theparking brake engaged can cause brakefailure and the risk of personal injury.
If the ABS indicator illuminateswhen you are driving, thisindicates a malfunction. Yourvehicle continues to have normal brakingwithout the anti-lock braking systemfunction. See an authorized dealer.
It also momentarily illuminates when youswitch the ignition on to confirm the lampis functional. If it does not illuminate whenyou switch the ignition on, or begins toflash at any time, have the system checkedby an authorized dealer.
The brake indicator momentarilyilluminates when you switch theignition on to confirm the lampis functional. It may also illuminate whenyou apply the parking brake and theignition is on. If it illuminates when yourvehicle is moving, make sure the parkingbrake is disengaged. If the parking brakeis disengaged, this indicates low brake fluidlevel or a brake system fault. See anauthorized dealer.
250
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMBrakesE170684 E67020 E270480 E67024

BRAKES – INFORMATION MESSAGES
DetailsMessage
The brake fluid level is low, check the brake system immedi-ately. See Checking the Brake Fluid (page 249).Brake Fluid Level Low
Have the system checked as soon as possible.Check Brake System
251
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMBrakes

BRAKES – FREQUENTLY ASKEDQUESTIONS
Is it normal for my brakes to makenoise?
Occasional brake noise is normal. If ametal-to-metal, continuous grinding, orsqueal sound is present, the brake liningcould be worn. Have the system checked.
There is an electrical motor soundwhen I press on the brake pedal oractivate the park brake switch. Isthis normal?
Yes, those sounds are the electronic brakebooster or the electronic park brakeoperating.
Note: Brake dust could accumulate on thewheels, even under normal drivingconditions. Some dust is normal as thebrakes wear and does not contribute tobrake noise. See Cleaning Wheels (page?).
252
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMBrakes

WHAT IS THE ELECTRIC
PARKING BRAKE
The electric parking brake is used to holdyour vehicle on slopes and flat roads.
APPLYING THE ELECTRIC
PARKING BRAKE
WARNING: Apply the parkingbrake, shift into park (P), switch theignition off and remove the key beforeyou leave your vehicle. Failure to followthis instruction could result in personalinjury or death.
WARNING: If you drive extendeddistances with the parking brake applied,you could cause damage to the brakesystem.
WARNING: The electric parkingbrake does not operate if the vehiclebattery has run out of charge.
The switch is on the lower partof the instrument panel.
Pull the switch up to apply the electricparking brake. The red warning lampflashes, then steadily illuminates when theparking brake is applied.
Note:You can apply the electric parkingbrake when the ignition is off.
Note:The electric parking brake couldautomatically apply when park (P) isselected. See Park (P) (page 234).
APPLYING THE ELECTRIC
PARKING BRAKE IN AN
EMERGENCY
You can use the electric parking brake toslow or stop your vehicle in an emergency.
Pull the switch up and hold it.
The red warning lamp illuminates, a tonesounds and the stoplamps turn on whenyou use the electric parking brake in anemergency.
The electric parking brake continues toslow your vehicle down unless you releasethe switch.
Note:Do not apply the electric parkingbrake when your vehicle is moving, exceptin an emergency. If you repeatedly use theelectric parking brake to slow or stop yourvehicle, you could cause damage to thebrake system.
MANUALLY RELEASING THE
ELECTRIC PARKING BRAKE
1.Switch the ignition on.
2.Press and hold the brake pedal.
3.Push the switch down.
The red warning lamp turns off.
Pulling Away on a Hill When Towing aTrailer
1.Press and hold the brake pedal.
2.Pull the switch upward and hold it.
3.Shift into gear.
4.Press the accelerator pedal until enginehas developed sufficient torque toprevent your vehicle from rolling downthe hill.
5.Release the switch and pull away in anormal manner.
253
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMElectric Parking BrakeE267156

AUTOMATICALLY RELEASING
THE ELECTRIC PARKING
BRAKE
1.Close the driver door.
2.Shift into gear.
3.Press the accelerator pedal and pullaway in a normal manner.
ELECTRIC PARKING BRAKE
AUDIBLE WARNING
Sounds when the parking brake is on andyour vehicle is moving. If the warning tonecontinues after you have released theparking brake, this indicates a malfunction.Have your vehicle checked as soon aspossible.
RELEASING THE ELECTRIC
PARKING BRAKE IF THE
VEHICLE BATTERY HAS RUN
OUT OF CHARGE
WARNING: The electric parkingbrake does not operate if the vehiclebattery has run out of charge.
Connect a booster battery to the vehiclebattery to release the electric parking brakeif the vehicle battery has run out of charge.See Jump Starting the Vehicle (page422).
ELECTRIC PARKING BRAKE –
TROUBLESHOOTING
ELECTRIC PARKING BRAKE –WARNING LAMPS
Brake System
It illuminates red when you applythe parking brake and yourvehicle is on. If the lamp flasheswhen the parking brake has beenreleased, this indicates theparking brake system requiresservice. Have your vehicle checked assoon as possible.
Note:Lamps may vary depending on region.
Electric Parking Brake
When the lamp illuminatesyellow, it indicates a malfunctionin the electric parking brake.Have your vehicle checked as soon aspossible.
Note:Lamps may vary depending on region.
254
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMElectric Parking BrakeE270480 E67024 E67024 E146190

ELECTRIC PARKING BRAKE – INFORMATION MESSAGES
ActionMessage
The electric parking brake is set and a manual releaseis attempted without the brake pedal being pressed.To Release: Press Brake andSwitch
The electric parking brake is set and an automaticrelease is attempted but cannot be performed.Perform a manual release.
Park Brake Use Switch toRelease
The electric parking brake is set and your vehicle speedexceeds 3 mph (5 km/h). Release the electric parkingbrake before continuing to drive.
Release Park Brake
The electric parking brake is not fully applied.Park Brake Not Applied
The electric parking brake is not fully released.Park Brake Not Released
The electric parking brake system has been put into aspecial mode to allow brake service. Have the systemchecked as soon as possible.
Brake maintenance mode
The electric parking brake system has detected acondition that requires service. Some functionalitymay still be available. Have the system checked assoon as possible.
Park Brake Limited FunctionService Required
The electric parking brake system has detected acondition that requires service. Have the systemchecked as soon as possible.
Park Brake Malfunction ServiceNow
255
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMElectric Parking Brake

DIESEL ENGINE EXHAUST
BRAKE – PRECAUTIONS
WARNING: Do not use tow/haulwhen the road surface is slippery. Failureto follow this instruction could result inthe loss of control of your vehicle.
WARNING: Do not use dieselengine exhaust braking when the roadsurface is slippery. Failure to follow thisinstruction could result in the loss ofcontrol of your vehicle.
USING THE DIESEL ENGINE
EXHAUST BRAKE
This feature increases engine braking athigher engine speeds to provide bettergrade descent control with less brake andtransmission wear and tear.
Note:Use this when driving downhill andcarrying heavy loads or trailering.
Benefits of engine braking are:
•Lower brake temperature.
•Reduced brake fade.
•Longer brake life.
•Improved driving and trailering control.
Press the button on the switchbank next to the audio unit toswitch the system on or off.
There are two engine brake modes, manualand automatic.
The following conditions must be met touse exhaust brake:
•Your vehicle is in a forward gear.
•The engine speed is above 1300 RPM.
•Your foot is off the accelerator.
You can use this feature with tow/haul orprogressive range selection to providefurther increased engine braking. Thetransmission upshifts to prevent the enginefrom entering the red zone on thetachometer.
Manual Engine Braking
1.Press the button to switch on manualengine braking.
2.Release the accelerator pedal tomaximize engine braking.
3.Apply the brakes. The transmissiondownshifts to lower gears.
Note:The engine braking feature onlyfunctions when you release the accelerator.
Note:You can shift the transmission tolower gears with progressive range selectionor manual shifting independent of pressingthe brakes.
Note:You can also use manual enginebraking with cruise control to improve gradedescent control.
Note:If your vehicle has adaptive cruisecontrol, the speed control system uses theselected engine brake mode, transmissiongears, and brakes to maintain the set speedand distance to the vehicle being followed.
Automatic Engine Braking
1.Press the button twice to switch onautomatic engine braking.
2.Release the accelerator or brake pedal.The system remembers your vehiclespeed.
256
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOMDiesel Engine Exhaust BrakeE171217