2024 FORD F650/750 brakes

Trailer Air Supply and ParkingBrake Modular Controls (If Equipped)
The trailer air supply valve delivers air tothe trailer supply and automatically popsout, shutting off the trailer supply, ifpressure decreases to approximately 35 psi(249 kPa).
The parking brake controls the springbrakes on the tractor. When you pull theknob out, it causes the trailer supply valveto pop out, applying both the tractor andtrailer parking brakes. You canindependently release the trailer brakes bypushing only the trailer air supply valve in.
Initial Charge
With the air system completely discharged,both knobs (A and B) are out. When theair pressure reaches 70 psi (481 kPa), thetrailer air supply (A - red knob) may bepushed in and should stay in, charging thetrailer air system and releasing the trailerbrakes.
You can push in the parking brake (B -yellow knob) and supply air to the tractorspring brakes, releasing them.
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Normal Driving PositionPush in both knobs (A and B) to supply airto both trailer and tractor spring brakes,releasing all brakes.
System Park
With both knobs (A and B) pushed in(normal driving position), the parkingbrakes for both the tractor and trailer canbe applied by pulling the parking brakeknob (B) out, exhausting air from thetractor spring brakes, simultaneouslycausing the trailer air supply valve to popout, applying the trailer brakes.
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Trailer Charge
If both knobs (A and B) are out, and youwant to recharge the trailer while leavingthe tractor spring brakes applied, the trailerair supply (A) can be pushed in to rechargethe trailer air supply line. You can also usethis mode to park a combination vehiclewith tractor spring brakes.
Automatic Application
If both knobs (A and B) are pushed in andthe brake system air pressure is reducedto approximately 35 psi (249 kPa), thetrailer air supply (A) knob automaticallypops out applying the emergency orparking brakes on the trailer. If the trailerair supply (A) knob is manually held in andthe air pressure is reduced toapproximately 30 psi (207 kPa), a tripper
piston within the valve moves, exhaustingthe trailer air supply, applying the trailerbrakes. Further reduction of air pressure,while holding the trailer air supply knob in,causes the parking brake knob to pop outat 25 psi (172 kPa).
Actuation of Trailer Park (Emergency)or Tractor Bobtail Position
To actuate the trailer brakes only, pull outthe trailer air supply (A) knob. This appliesthe trailer brakes whether the trailer usesemergency or spring brakes.
You can also use this mode when thetractor or truck with trailer is used duringbobtail operation.
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PRINCIPLE OF OPERATION
The traction control system helps avoiddrive wheel spin and loss of traction.
If your vehicle begins to slide, the systemapplies the brakes to individual wheelsand, when needed, reduces engine powerat the same time. If the wheels spin whenaccelerating on slippery or loose surfaces,the system reduces engine power in orderto increase traction.
USING TRACTION CONTROL -
VEHICLES WITH: AIR BRAKES
WARNING: Operating your vehiclewith the traction control disabled couldlead to an increased risk of loss of vehiclecontrol, vehicle rollover, personal injuryand death.
Press the TCS Off button on theinstrument panel to enable themud/snow mode.
This is beneficial when your vehicle is stuckin snow or on a slippery road surface. Thismode allows wheel spin to dig your vehicleout and allows you to rock your vehicle.
Press the switch again to select standardtraction control. The system automaticallyselects standard traction control at thenext ignition cycle.
System Indicator Light
Note:If the traction control light does notflash during a traction control event or staysilluminated, the system is not functioningproperly. Take your vehicle to an authorizeddealer for service.
During traction control operation, thetraction control light flashes rapidly andthe engine does not rev-up when you pressfurther on the accelerator. This is normaland is no reason for concern.
In mud/snow mode, the TCS OFF lightilluminates on the instrument cluster. If atraction event occurs in either mode, thestability and traction control light flashesrapidly.
USING TRACTION CONTROL -
VEHICLES WITH: HYDRAULIC
BRAKES
WARNING: Operating your vehiclewith the traction control disabled couldlead to an increased risk of loss of vehiclecontrol, vehicle rollover, personal injuryand death.
The system turns on each time you switchthe ignition on.
Use the traction control buttonon the instrument panel toswitch the system off or on.
If your vehicle is stuck in mud or snow,switching traction control off is beneficialas this allows the wheels to spin.
Press the button again to switch thetraction control system on.
System Indicator Light
Note:If the traction control light does notflash during a traction control event or stayson, the system is not operating. Have thesystem checked as soon as possible.
During a traction control event, the tractioncontrol light rapidly flashes. Pressingfurther on the accelerator does not causethe engine to rev higher. This is normal andis no reason for concern.
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PRINCIPLE OF OPERATION -
VEHICLES WITH: HYDRAULIC
BRAKES
WARNING: Vehicle modificationsinvolving braking system, aftermarketroof racks, suspension, steering system,tire construction and wheel and tire sizemay change the handling characteristicsof your vehicle and may adversely affectthe performance of the electronicstability control system. In addition,installing any stereo loudspeakers mayinterfere with and adversely affect theelectronic stability control system. Installany aftermarket stereo loudspeaker asfar as possible from the front centerconsole, the tunnel, and the front seatsin order to minimize the risk of interferingwith the electronic stability controlsensors. Reducing the effectiveness ofthe electronic stability control systemcould lead to an increased risk of loss ofvehicle control, vehicle rollover, personalinjury and death.
WARNING: Remember that evenadvanced technology cannot defy thelaws of physics. It's always possible tolose control of a vehicle due toinappropriate driver input for theconditions. Aggressive driving on anyroad condition can cause you to losecontrol of your vehicle increasing the riskof personal injury or property damage.Activation of the electronic stabilitycontrol system is an indication that atleast some of the tires have exceededtheir ability to grip the road; this could
reduce the operator's ability to controlthe vehicle potentially resulting in a lossof vehicle control, vehicle rollover,personal injury and death. If yourelectronic stability control systemactivates, SLOW DOWN.
The system turns on each time you switchthe ignition on.
If a fault occurs in either the stabilitycontrol or the traction control system, thefollowing conditions are possible:
•The stability and traction control lightilluminate.
•The stability control and tractioncontrol systems are not maintainingtraction of the wheels.
If a driving condition activates either thestability control or the traction controlsystem, the following conditions arepossible:
•The stability and traction control lightflash.
•Your vehicle slows down.
•The system reduces engine power.
•A vibration in the brake pedal.
•The brake pedal is stiffer than usual.
•If the driving condition is severe andyour foot is not on the brake, the brakepedal could move as the systemapplies higher brake force.
The stability control system has severalfeatures built into it to help you maintaincontrol of your vehicle:
Electronic Stability Control
The system assists in preventing skids orlateral slides by applying the brakes to oneor more of the wheels individually and, ifnecessary, decreases engine power.
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Traction Control
The system helps maintain traction of thewheels by detecting and controlling wheelspin. See Using Traction Control (page151).
Vehicle without stability controlskidding off its intended route.A
Vehicle with stability controlmaintaining control on a slipperysurface.
B
PRINCIPLE OF OPERATION -
VEHICLES WITH: AIR BRAKES
WARNING: Vehicle modificationsinvolving braking system, aftermarketroof racks, suspension, steering system,tire construction and wheel and tire sizemay change the handling characteristicsof your vehicle and may adversely affectthe performance of the electronicstability control system. In addition,installing any stereo loudspeakers may
interfere with and adversely affect theelectronic stability control system. Installany aftermarket stereo loudspeaker asfar as possible from the front centerconsole, the tunnel, and the front seatsin order to minimize the risk of interferingwith the electronic stability controlsensors. Reducing the effectiveness ofthe electronic stability control systemcould lead to an increased risk of loss ofvehicle control, vehicle rollover, personalinjury and death.
WARNING: Remember that evenadvanced technology cannot defy thelaws of physics. It's always possible tolose control of a vehicle due toinappropriate driver input for theconditions. Aggressive driving on anyroad condition can cause you to losecontrol of your vehicle increasing the riskof personal injury or property damage.Activation of the electronic stabilitycontrol system is an indication that atleast some of the tires have exceededtheir ability to grip the road; this couldreduce the operator's ability to controlthe vehicle potentially resulting in a lossof vehicle control, vehicle rollover,personal injury and death. If yourelectronic stability control systemactivates, SLOW DOWN.
The system automatically turns on eachtime you switch the ignition on.
If a fault occurs in either the stabilitycontrol or the traction control system, youmay experience the following conditions:
•The stability and traction control lightilluminates steadily.
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•The stability control and tractioncontrol systems do not enhance yourvehicle's ability to maintain traction ofthe wheels.
If a driving condition activates either thestability control or the traction controlsystem you may experience the followingconditions:
•The stability and traction control lightflashes rapidly.
•Your vehicle slows down.
•Reduced engine power.
The stability control system has severalfeatures built into it to help you maintaincontrol of your vehicle:
Electronic Stability Control
The system enhances your vehicle’s abilityto prevent skids or lateral slides byapplying brakes to one or more of thewheels individually and, if necessary,reducing engine power.
Roll Stability Control
The system enhances your vehicle’s abilityto prevent rollovers by detecting yourvehicle’s motion and the rate at which itchanges by applying the brakes to one ormore wheels individually.
Traction Control
The system enhances your vehicle’s abilityto maintain traction of the wheels bydetecting and controlling wheel spin. SeeUsing Traction Control (page 151).
Vehicle without stability controlskidding off its intended route.A
Vehicle with stability controlmaintaining control on a slipperysurface.
B
USING STABILITY CONTROL
The system automatically turns on eachtime you switch the ignition on
You cannot switch the stability control androll stability control systems off, but whenyou shift into reverse (R), the systemsdeactivate.
You can switch the traction control systemoff or on. See Traction Control (page 151).
Limitations of the Stability System
Stability Control effectiveness may begreatly reduced if:
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•Your load shifts due to improperretention, accident damage or theinherently mobile nature of some loads,for example, hanging meat, liveanimals or partially laden tankers.
•Your vehicle or load has an unusuallyhigh or off-set center of gravity.
•Your brakes are not properly adjustedor maintained.
•One side of your vehicle drops off thepavement at an angle that is too greatto be counteracted by a reduction inspeed.
To Maximize the Effectiveness OfStability Control
•Make sure that the weight of your loadis evenly distributed, from front to back,side to side and you secure it properlyat all times.
•Exercise extreme caution at all timeswhile driving and avoid sharp turns,sudden steering inputs or abrupt lanechanges at high speeds, particularly if:
•Hauling loads that can shift.
•Your vehicle or load has a high oroff-set center of gravity whenloaded.
•You are towing doubles or triples.
Electronic Stability Control Usage withTractor/Trailer
The electronic stability control system isdesigned to work with trailer air brakesystems. We do not recommend its usewith any other trailer brake system.
Electronic Stability Control and Towingwith Non-tractor Trucks (Straight orKick-up Frame)
Non-tractor trucks (straight or kick-upframe) with air brake electronic stabilitycontrol, should not be used for towing anytype of trailer.
Chassis Modifications
Stability control is specifically calibratedand validated only for your vehicle'soriginal configuration. If you alter yourvehicle's chassis components, for example,a wheel base extension or reduction, tagaxle addition or removal, a major bodychange such as conversion of a tractor intoa truck. Ford Motor Company is notresponsible for the performance of thestability control system if you modify anymajor components such as axle,suspension or steering system.
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