2012 FORD F750 parking brake

Actuation of trailer park (emergency) or tractor bobtail position
To actuate the trailer brakes only, pull out the trailer air supply knob (1).
The trailer brakes are now applied whether emergency or spring brakes
are used on the trailer.
This mode is also used when the tractor or truck with trailer is used
during bobtail operation.
ANTI-LOCK BRAKE SYSTEM (ABS)
Your vehicle is equipped with an anti-lock braking system (ABS). This
system helps you maintain steering control during emergency stops by
keeping the brakes from locking. Noise from the ABS pump motor and
brake pedal pulsation may be observed during ABS braking; any
pulsation or mechanical noise you may feel or hear is normal.
When hard braking is required, apply continuous force on the brake
pedal. Do not pump the brake pedal since this reduces the effectiveness
of the ABS and increases your vehicle’s stopping distance. The ABS
activates immediately, allowing you to retain steering control during hard
braking and on slippery surfaces. However, the ABS does not decrease
stopping distance.
ABS warning light
The
light in the instrument cluster momentarily illuminates when the
ignition is turned on. If the light does not illuminate during start up,
remains on after the vehicle reaches 5–10 mph (8–16 km/h), or flashes,
the ABS may be disabled and may need to be serviced.
Even when the ABS is disabled, normal braking is still effective. If
the
light illuminates with the parking brake released, have your
brake system serviced immediately.
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BRAKE-SHIFT INTERLOCK
Vehicles equipped with a gasoline engine have a brake-shift interlock
feature that prevents the gearshift lever from being moved from P (Park)
when the ignition is in the on position and the brake pedal is not pressed.
If you cannot move the gearshift lever out of P (Park) with the ignition
in the on position and the brake pedal pressed, it is possible that a fuse
has blown or the vehicle’s brake lamps are not operating properly. Refer
toFuses and relaysin theRoadside Emergencieschapter.
If the fuse is not blown and the brake lamps are working properly, the
following procedure will allow you to move the gearshift lever from P (Park):
1. Apply the parking brake, and turn
the engine off.
2. Remove the lower finish panel
below the steering column
3. Turn the key to on (position 4),
but do not start engine.
4. Pull back on the solenoid, and at
the same time, shift the
transmission into N (Neutral).
5. Start the vehicle.
See your authorized dealer as
soon as possible if this
procedure is used.
WARNING:Do not drive
your vehicle until you verify
that the brake lamps are working.
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WARNING:When doing this procedure, you will be taking the
vehicle out of park which means the vehicle can roll freely. To
avoid unwanted vehicle movement, always fully set the parking brake
prior to doing this procedure. Use wheel chocks if appropriate.
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.
AUTOMATIC TRANSMISSION OPERATION (IF EQUIPPED)
Main transmission, auxiliary transmission, transfer case and power take-off
(PTO) control shift patterns can be found on a placard or decal on the
driver’s sun visor, on the instrument panel or on the shift control itself.
The main transmission control is used to select the various gear ratios or
speeds of the transmission. Selecting D (Direct Drive), does not change
the transmission gear ratio, but is used where the gear ratios in the main
transmission are adequate to handle the vehicle operation.
If the transmission fails to shift properly, check the inline 10A fuse
located in the battery cables above the battery.
WARNING:Hold the brake pedal down while you move the
gearshift lever between positions. If you don’t hold the brake
pedal down, your vehicle may move unexpectedly and cause property
damage, personal injury or death.
6–speed TorqShifttransmission
This vehicle is equipped with an adaptive transmission shift strategy.
Adaptive transmission shift strategy offers the optimal transmission
operation and shift quality. When the vehicle’s battery has been
disconnected for any type of service or repair, the transmission will need
to relearn the normal shift strategy parameters, much like having to reset
your radio stations when your vehicle battery has been disconnected.
The adaptive transmission shift strategy allows the transmission to
relearn these operating parameters. This learning process could take
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several transmission upshifts and downshifts; during this learning
process, slightly firmer shifts may occur. After this learning process,
normal shift feel and shift scheduling will resume.
P (Park)
This position locks the transmission and prevents the rear wheels from
turning.
To put your vehicle in gear:
1. Start the engine
2. Press the brake pedal
3. Move the gearshift lever into the desired gear
To put your vehicle in P (Park):
1. Come to a complete stop
2. Move the gearshift lever and securely latch it in P (Park)
WARNING:Always set the parking brake fully and make sure
the gearshift is latched in P (Park). Turn the ignition to the off
position and remove the key whenever you leave your vehicle.
R (Reverse)
With the gearshift lever in R (Reverse), the vehicle will move backward.
Always come to a complete stop before shifting into and out of R
(Reverse).
N (Neutral)
With the gearshift lever in N (Neutral), the vehicle can be started and is
free to roll. Hold the brake pedal down while in this position.
D (Drive)
This is the normal driving position for the best fuel economy. This
position allows automatic upshifts and downshifts through gears one
through six.
4 (Fourth)
This position allows automatic upshifts and downshifts in gears one
through four.
2 (Second)
Use 2 (Second) to start-up on slippery roads or to provide additional
engine braking on downgrades.
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1 (First)
•Provides maximum engine braking.
•Allows upshifts by moving gearshift lever.
•The transmission will not downshift into 1 (First) at high speeds; it
will downshift to a lower gear and then shift into 1 (First) when the
vehicle reaches slower speeds.
Forced downshifts
•Allowed in 4 (Fourth).
•Press the accelerator to the floor.
•Allows transmission to select an appropriate gear.
Allison 2200 with parking pawl feature
Note:For Allison automatic transmission-equipped vehicles, also refer to
the separateAllison Transmission Operator’s Manual.
A parking pawl effectively grounds the transmission’s output shaft
preventing rotation of the driveline. If the vehicle is stationary, selecting
the P (Park) position places the transmission in neutral and engages the
parking pawl. Always use the parking brake when parking the vehicle.
WARNING:Always set the parking brake fully. Do not use the
gearshift in place of the parking brake.
Note:If the P (Park) position is selected when the vehicle is in motion,
the parking pawl mechanism ratchets andDOES NOThold the truck.
WARNING: To avoid sudden, unexpected vehicle
movement and possible personal injury or death:
1. Bring the vehicle to a complete stop.
2. Shift the transmission into P (Park). Slowly lift your foot from the
brake pedal to engage the transmission parking pawl mechanism.
3. Apply the parking brake and make sure it is holding properly. Do not
rely solely on the parking mechanism of the transmission.)
4. Turn the engine off when you leave the vehicle.Never leave the
vehicle unattended when the engine is running.
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Allison 2500
This transmission is available with a column-mounted gearshift lever. The
gear positions are displayed on the RNDL in the instrument cluster.
WARNING: To avoid sudden, unexpected vehicle
movement and possible personal injury or death:
1. Bring the vehicle to a complete stop.
2. Shift the transmission into N (Neutral).
3. Apply the parking brake and make sure it is holding properly.
4. Turn the engine off when you leave the vehicle.Never leave the
vehicle unattended when the engine is running.
Transmission fluid operating temperatures - 2200/2500 models
Allison 2200 and 2500 models:The sump/fluid reservoir temperatures
should not exceed 250°F (120°C). The converter temperature should not
exceed 300°F (144°C). he sump/fluid reservoir temperature should not
exceed 250 F (120 C).
TorqShift6-Speed models:The sump/fluid reservoir temperatures
should not exceed 250°F (120°C).
Allison 3000 series
The Allison 3000 Series offers two shift modes: Performance and
Economy. Performance Mode gives the best all-around transmission
operation; Economy Mode provides operation at lower engine RPM while
maintaining adequate performance. The transmission defaults to
Performance Mode when you start the engine. Pressing MODE on the
shifter activates Economy Mode and illuminates the Mode ON lamp.
If the engine speed is above idle when a gear is selected using the
shifter, the vehicle won’t move; the shifter must be moved to re-select a
gear after the engine speed returns to idle.
Note:For more information regarding the Allison 3000 Series, refer to
the separateAllison 3000 Series Operator’s Manual.
Torque lock
If your vehicle is parked on an incline and P (Park) is not properly
engaged (the parking brake is not applied before the transmission is
shifted into P [Park]), the weight of the vehicle may generate an
excessive amount of torque on the parking pawl, making it difficult to
shift the transmission out of P (Park). Hold the brake pedal down while
shifting out of P (Park), then release the parking brake.
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PTO operation with vehicle stationary
Stop the vehicle, idle the engine and set the parking brake. Make sure the
gear selector is in any forward drive range, then engage the PTO. After the
PTO is engaged, move the range selector to N (Neutral). Increase the engine
speed until the desired PTO operation speed is obtained. To disengage the
PTO after operation with the vehicle standing, release the throttle, allow the
drive equipment to come to a stop, and then disengage the PTO.
WARNING:When the PTO is operated with the vehicle
stationary, the transmission must be placed in N (Neutral) with
the parking brake set. If the transmission is not in N (Neutral) and is
equipped with a remote throttle control, an increase in engine speed
can overpower the parking brake and cause the vehicle to move,
possibly resulting in personal injury and/or property damage.
PTO operation while vehicle is moving
After the PTO is engaged for driven vehicle operation, shift to the desired
range and drive the vehicle. The speed of the PTO, during this period of
operation, always maintains direct relation to vehicle speed. PTO speed
decreases in relation to vehicle (transmission output) speed as shifts to a
higher gear occur. When operating the PTO while the vehicle is moving,
the PTO may be disengaged whenever it is no longer required. When there
is no load on the PTO gear, it can be pulled out of engagement.
Vehicles equipped with an Allison 3000 Series automatic transmission
The PTO drive gear is engine-driven and provides direct engine power.
The PTO can be operated when the vehicle is either stationary or
moving. The PTO gear is in constant mesh with the drive gear in the
torque converter housing. A friction clutch or constant drive is used to
transmit power to the PTO.
Vehicles equipped with a manual transmission
Transmission-mounted PTO units are available for local installation on
your vehicle. See yourBody Builder’s Layout Bookfor restrictions on
use and installation of PTO units.
To engage the PTO unit, stop the vehicle and place the transmission in N
(Neutral). Press the clutch and allow the gears to stop rotating, then
engage the PTO unit. The PTO can also be selected with the
transmission in gear as long as the clutch is pressed.
When operating the PTO with the vehicle stationary, first set the parking
brake (chock the wheels if the vehicle is on a hill or another uneven
surface).
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6. Set the tractor parking brakes and fully raise the trailer landing gear.
Refer toBrakesin this chapter for proper operation of the parking brake
and trailer brakes.
7. Check the operation of all trailer lights and correct any lights that may
be faulty.
Un-hook
1. Try to keep the tractor and trailer in a straight line.
2. Apply the parking brakes.
3. Lower the trailer landing gear, making sure it is on solid, level ground.
The weight of the trailer is to be on the landing gear.
4. Block the trailer wheels.
5. Disconnect the brake hoses and light cords. Be sure hoses and cords
are clear.
6. Pull coupler release lever to disengage the fifth-wheel jaws.
7. Release the tractor parking brakes.
8. Pull out from the trailer slowly, allowing the landing gear to take the
load gradually.
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