2016 FORD F750 brakes

The anti-lock braking system will not
eliminate the risks when:
•
You drive too closely to the vehicle in
front of you.
• Your vehicle is hydroplaning.
• You take corners too fast.
• The road surface is poor.
PARKING BRAKE
Hydraulic Brakes WARNINGS
Do not use the gearshift selector in
place of the parking brake. Always
set the parking brake fully AND make
sure the transmission is in park (P) or
neutral (N). Use of wheel chocks is also
recommended in hilly or off-road usage.
Unexpected and possible sudden vehicle
movement may occur if these precautions
are not taken. If the parking brake is fully released
but the parking brake warning lamp
remains illuminated, the brakes may
not be working properly. See your dealer
or a qualified service technician. Apply the parking brake whenever the
vehicle is parked. To set the parking brake,
pull the handle up until it snaps into the
locked position.
When the parking brake is out of
adjustment, seek service immediately.
The parking brake warning lamp
in the instrument cluster
illuminates, and remains
illuminated (when you switch on the
ignition), until you release the parking
brake. Push the palm release lever (A) on the
parking brake handle (B) and push down
as far as possible to release the brake.
Driving with the parking brake on causes
the brakes to wear out quickly and reduces
fuel economy.
We recommend you not use the parking
brake to stop a moving vehicle. However,
if the normal brakes fail, you can use the
parking brake to stop your vehicle in an
emergency. Since the parking brake only
applies retardation to the rear wheels, the
vehicle's stopping distance increases
greatly and the handling of your vehicle is
adversely affected.
Applying the Parking Brake
Note:
If the light blinks and a warning tone
sounds when you pull the control knob, the
parking brake is not functioning properly.
Seek immediate service from your dealer.
Pull the yellow, dash-mounted parking
brake knob. The parking brake light
illuminates indicating that the parking
brake has been successfully set.
Releasing the Parking Brake WARNING
Hold the brake pedal down while
moving the gearshift lever from
position to position. If the brake
pedal is not held down, the vehicle may
move unexpectedly resulting in property
damage, personal injury or death. 121
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Note:
Read and understand the following
steps and perform them whenever you
prepare to drive the vehicle.
Note: The parking brake does not disengage
unless sufficient system air pressure is
available.
1. Press and hold the service brake pedal
while the engine is running.
2. Select the appropriate drive gear.
3. Push and hold the yellow dash-mounted parking brake knob until
the parking brake light turns off, then
release.
Parking Brake Light Illumination due
to Low Air Pressure
If the air pressure becomes too low at any
time during vehicle operation, the parking
brake may apply and the parking brake
light turns on.
If the parking brake applies due to low air
pressure, immediate service is required to
the parking brake system.
Parking Brake Warning System
If the parking brake light blinks and a tone
sounds when pulling the yellow control
knob out, this indicates the parking brake
is not functioning properly. Seek service for
the parking brake immediately.
With the ignition key not in the run position:
• A tone sounds if the parking brake
remains released (or in an unknown
state). The tone stops after
approximately 8 minutes or until the
parking brake is applied. Seek service
for the parking brake immediately. Diesel engines: Parking brake light
operation (the light only works when the
ignition key is in the run position):
• On:
Parking brake applied.
• Off:
Parking brake released and no
faults or malfunctions detected.
• Blink and tone:
Parking brake
released (or in an unknown state) and
faults or malfunctions detected.
Releasing Spring Manually WARNINGS
Do not attempt to disassemble the
parking brake chamber under any
circumstances. The high spring load
may cause serious injury. Block the wheels to help prevent the
vehicle from moving.
Unexpected and possibly sudden
vehicle movement may occur if these
precautions are not taken.
If you release hydraulic pressure from the
spring brake chamber the power spring
applies the brake and, unless hydraulic
pressure can be re-established, you must
release the spring brake as follows in order
to move your vehicle.
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Loosen the jam nut (A) and un-thread the
adjustment rod (B) from the chamber to
reduce tension on the cable (C). Continue
to un-thread the adjustment rod all the
way and remove it from the chamber.
Air Brakes
WARNING
This control is used for parking only.
Do not leave the vehicle unattended
after setting the parking brake
without placing the transmission park (P).
Use of wheel chocks is also recommended
in hilly or off-road usage. If the service brakes should fail to operate
while your vehicle is moving, you can make
an emergency stop with the parking brake.
Since the parking brake only applies
stopping power to the rear wheels, your
vehicle
’s stopping distance greatly
increases and the handling of your vehicle
is adversely affected. Make repairs
immediately to an inoperative air brake
system circuit. Pull the yellow parking brake knob out to
apply the parking brake. Push the knob in
to release the parking brake.
The parking brake light
illuminates and remains
illuminated (when you switch
the ignition to the on position) until you
release the parking brake. Releasing Spring Brake with Air
Pressure
The air system in all vehicles with
spring-actuated rear wheel parking brakes
is equipped with a valve located on the
governor for connection to an outside air
supply. The valve lets you recharge the
system with air from an outside source,
releasing the spring-actuated parking
brakes. Your vehicle is now ready to tow in
an emergency.
You can only use an outside air source if
the protected system is in operating
condition. If you cannot restore air pressure
in the protected air system, you must
release the spring-actuated brakes
manually.
Releasing Spring Manually
WARNINGS
Do not attempt to disassemble the
parking brake chamber under any
circumstances. The high spring load
may cause serious injury if the chamber
clamps are removed. Block the wheels to help prevent the
vehicle from moving.
Unexpected and possibly sudden
vehicle movement may occur if these
precautions are not taken.
If you release air pressure from the spring
brake chamber, the power spring applies
the brake and, unless air pressure can be
re-established, you must release the spring
brake as follows in order to move your
vehicle.
Do not use impact wrenches as they may
damage the piston and prevent proper
caging of the spring. Do not apply more
than 50 lb.ft (68 Nm) to the release bolt
nut.
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1.
Remove the stud tool and nut from the
carrying pocket on the brake chamber
assembly. 2. Remove the access plug from the end
of the spring chamber.
3. Insert the release stud through the opening in the chamber and into the
spring pressure plate. 4.
Turn the release stud ¼ turn to engage
the stud tangs with the slot in the
pressure plate. Keep the stud engaged
and install the nut on the release stud.
5. Tighten the nut until the spring is fully caged and brakes released. Do not
loosen or remove the release stud and
nut unless you completely assemble
and securely clamp the brake chamber.
6. After restoring the air pressure, unscrew and remove the release stud
and install in the carrying pocket. Install
the access plug. FULL POWER BRAKE WARNING
If the brake warning lamp in the
instrument cluster remains
illuminated after engine start up, this
indicates a system failure in the Full Power
Brake system. Stop the vehicle safely as
soon as possible and seek service
immediately. This system incorporates standard braking,
an anti-lock braking system (ABS) and
optional Power Park Brake into one fully
integrated hydraulic brake system. With
the Full Power Brake system, braking
energy is stored, similar to an air brake
system, resulting in faster response times
and shorter stopping distances. This is
accomplished using motor and pump
assemblies that pressurize the system by
pumping brake fluid into accumulators.
This is similar to the air compressor of an
air brake system pressurizing the air tanks.
The system includes a master cylinder that
provides the normal pedal feel and
transfers the pedal force, via brake fluid,
to the main components of the system.
Note:
The motor and pumps run
momentarily with the ignition switch in the
on or run position, or in the off position with
the brake pedal pressed.
Note: During normal driving, you may hear
the pump and motors replenishing the
accumulators. This is a normal function of
the system.
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AIR BRAKES
WARNINGS
Do not drive or continue to drive if the
low air pressure buzzer is sounding
or the brake warning light is lit. These
warnings indicate that air pressure is not
to normal operating level. Continued use
of the vehicle could result in loss of braking
ability. Avoid repeated light application of
the brake pedal. This depletes air
pressure faster and could result in
loss of braking capability. Do not move the vehicle when the
air pressure is insufficient because
the brake system may be inoperative.
After starting the engine, give the air
compressor time to build up the air
pressure to 60 psi (414 kPa) before moving
your vehicle. Periodically check the air pressure gauge
while driving. Pressure should range
between approximately 100 psi (690 kPa)
to
130 psi (896 kPa). The air compressor
governor cut-in and cutout pressure
settings are set at the factory and are not
adjustable. When air pressure is insufficient
(below
60 psi (414 kPa)), a
warning light illuminates and a
buzzer sounds when the ignition is in the
on position. This may happen because
excessive brake applications are depleting
the system air pressure. If this condition
occurs, stop driving your vehicle until the
compressor has fully recharged the air
system.
Select a gear ratio to help slow your vehicle
before descending grades. Supplementing
with brakes, as required, help to safely slow
the vehicle and avoids overspeeding the
engine.
Air Chamber Stroke Indication
Air chamber push rods have orange stroke
indicator markers that warn when the
braking system requires adjustment or
repair. The painted orange indicator is on
the air chamber push rod at the slack
adjuster stroke dimension that requires
service when visible during brake
application.
A qualified service technician should
perform air brake inspection and
adjustment or repairs keeping to the
instructions in the service manual.
Cam Brakes - Automatic Slack
Adjusters WARNING
Do not manually adjust the
automatic slack adjusters to correct
excessive push rod stroke as it may
result in reduced brake effectiveness and
a vehicle crash. Excessive push rod stroke
indicates that a problem exists with the
automatic adjuster, with the installation
of the adjuster, or with foundation brake
components that manual adjustment does
not remedy. Seek service from a qualified
facility for excessive push rod stroke. 125
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Standard air brakes (cam) are equipped
with automatic brake adjusters. Automatic
adjustment occurs during brake
applications. Inspect brakes for proper
adjustment at the specified intervals. See
Scheduled Maintenance (page 314).
Emergency Air Brake WARNING
Do not continue to operate the
vehicle with a failure of one of the
brake systems. Take the vehicle to
your dealer for service immediately. All vehicles are equipped with a dual brake
system. In the unlikely event of a failure of
one system, the second system functions
for emergency stopping. The brake pedal
controls all these systems in the same
manner as for normal stops.
EXHAUST BRAKE
WARNING
The exhaust brake is not
recommended for use on slippery or
low traction road surfaces. Under
these conditions a loss of vehicle control
could occur. Note:
Installing an exhaust or auxiliary
brake does not necessarily protect the
engine from exceeding maximum governed
speed. Use the primary brakes to make sure
the engine never exceeds maximum
governed speed under any circumstance.
Note: Before starting the engine, make sure
that the exhaust brake switch is in the off
position. Do not turn the exhaust brake on
until the engine has reached normal
operating temperature.
Note: Maximum exhaust brake
performance relates to the type of
transmission your vehicle has.
Note: Engine speed has a major influence
of retarding performance. When engine
speed stays at the maximum allowable
level, the exhaust brake operates at peak
performance.
Note: Exhaust brakes operate effectively
with automatic transmissions, but
performance varies with engine speed and
the gear selected by the transmission.
An exhaust brake is an auxiliary braking
system that assists, but does not replace,
the primary service brake system. It helps
control vehicle speed; it is not a
vehicle-stopping device.
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A switch on the instrument panel, in
combination with the accelerator and
clutch pedal, allow the operator to make
maximum use of the exhaust brake in the
following conditions:
•
Off-highway driving.
• Mountain driving.
• Heavy traffic.
• High-speed highway driving.
To switch the brake on, push the switch
up. Push the switch down to turn it off.
While approaching a steep grade, make
sure that the exhaust brake switch is in the
on position. The exhaust brake begins
working as soon as you remove your foot
from the accelerator pedal.
Before descending a hill or steep grade,
always select the proper gear. If you take
the transmission out of gear while
descending, it is possible that you cannot
select another gear because of maximum
governed RPM. Make sure the engine speed does not
exceed the maximum allowable engine
RPM. Exceeding the maximum allowable
engine RPM can result in damage to the
engine. Apply the service brakes to reduce
the engine RPM or make a slower descent
by using a lower gear.
While going down the grade, use a low
enough gear to descend safely with a
minimum application of the service brakes.
As a general guideline, use the same gear
as you use to ascend the hill.
Exhaust Brake Operating
Characteristics
The exhaust brake turns on when you
remove your feet from both the accelerator
and clutch pedals and the exhaust brake
switch is in the on position. The following
conditions exist if the brake is operating
properly:
•
A slight change in engine sound when
the exhaust brake turns on.
• A smooth braking effect. Do not expect
a retarding effect similar to sudden,
hard application of the service brakes.
• The retarding force possibly felt acting
against your body during brake
application (depending on the grade
and vehicle load). This force is actually
preventing the vehicle from going much
faster.
• Engine temperature remaining in the
normal operating range.
• The tachometer showing a drop in
engine RPM (depending on grade and
vehicle load) during a descent.
• A decrease in road speed when
applying the exhaust brake during a
descent, except when your vehicle is
carrying a heavy load or the grade is
extremely steep. In these instances,
you may need to apply the service
brakes occasionally.
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TRAILER BRAKES
Trailer Brake Hand Control (If Equipped)
WARNING
The hand control should never be
used to apply the brakes when the
tractor and trailer are parked
unattended. Air may leak from the system
and the vehicle could possibly move,
resulting in possible property damage,
personal injury or death. The hand control is located on the
right-hand side of the instrument panel. It
applies the trailer service brakes, which are
independent of the truck or tractor service
brakes.
It operates a valve that provides gradual
control of air pressure applied. When the
valve is only partially applied, you can
override the trailer brakes by pressing fully
on the brake pedal.
To apply the trailer brakes using the hand
control, move the lever downward. The
further you push the lever down, the
greater the air pressure is applied to the
brakes. The lever remains in place until
manually moved. To release the trailer brakes, move the
lever up completely.
Trailer Air Supply and Parking
Brake Modular Controls (If Equipped)
The trailer air supply valve delivers air to
the trailer supply and automatically pops
out, shutting off the trailer supply, if
pressure decreases to approximately 35 psi
(249 kPa)
.
The parking brake controls the spring
brakes on the tractor. When you pull the
knob out, it causes the trailer supply valve
to pop out, applying both the tractor and
trailer parking brakes. You can
independently release the trailer brakes by
pushing only the trailer air supply valve in.
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