2020 Ram ProMaster brakes

52GETTING TO KNOW YOUR INSTRUMENT PANEL
Certain conditions, such as a loose or missing
gas cap, poor quality fuel, etc., may illuminate
the light after engine start. The vehicle should
be serviced if the light stays on through several
typical driving styles. In most situations, the
vehicle will drive normally and will not require
towing.
When the engine is running, the MIL may flash
to alert serious conditions that could lead to
immediate loss of power or severe catalytic
converter damage. The vehicle should be
serviced by an authorized dealer as soon as
possible if this occurs.
Anti-Lock Brake (ABS) Warning Light
This light monitors the Anti-Lock
Brake System (ABS). The light will turn
on when the ignition is placed in the
ON/RUN or MAR/ON/RUN position
and may stay on for as long as four seconds.
If the ABS light remains on or turns on while
driving, then the Anti-Lock portion of the brake
system is not functioning and service is
required. However, the conventional brake
system will continue to operate normally if the
brake warning light is not on.
If the ABS light is on, the brake system should
be serviced as soon as possible to restore the
benefits of Anti-Lock Brakes. If the ABS light
does not turn on when the ignition is placed in
the ON/RUN or MAR/ON/RUN position, have
the light inspected by an authorized dealer.
Generic Warning Light
The Generic Warning Light will illumi -
nate if any of the following conditions
occur: Engine Oil Pressure Sensor
Failure, External Light Failure, Fuel
Cut-Off intervention or fail, Parking Sensor
Failure, DST System Failure.
The telltale will remain on fixed in case of swivel
seat failure and on blinking in case of Air Bag
Warning Light Failure. Contact an authorized
dealer immediately for service.
Yellow Indicator Lights
Stop Light Failure Indicator Light
This light will illuminate if one or more
of the stop light bulb fails.
The failure relating to this light could be:
One or more blown bulbs.
A blown protection fuse.
A break in the electrical connection.
WARNING!
A malfunctioning catalytic converter, as
referenced above, can reach higher
temperatures than in normal operating
conditions. This can cause a fire if you drive
slowly or park over flammable substances
such as dry plants, wood, cardboard, etc. This
could result in death or serious injury to the
driver, occupants or others.
CAUTION!
Prolonged driving with the Malfunction
Indicator Light (MIL) on could cause damage
to the vehicle control system. It also could
affect fuel economy and driveability. If the
MIL is flashing, severe catalytic converter
damage and power loss will soon occur.
Immediate service is required.

20_VF_OM_EN_US_t.book Page 52

56
(Continued)
SAFETY
SAFETY FEATURES
Four-Wheel Anti-Lock Brake System (ABS)
The Four-Wheel Anti-Lock Brake System (ABS) is
designed to aid the driver in maintaining vehicle
control under adverse braking conditions. The
system operates with a separate computer to
modulate hydraulic pressure, to prevent wheel
lock-up and to help avoid skidding on slippery
surfaces.
The system's pump motor runs during an ABS
stop to provide regulated hydraulic pressure.
The pump motor makes a low humming noise
during operation, which is normal.
The ABS includes an amber ABS Warning
Light. When the light is illuminated, the ABS is
not functioning. The system reverts to stan-
dard non-anti-lock brakes. Placing the ignition
in the OFF mode and to the ON mode again
may reset the ABS if the fault detected was
only momentary. When you are in a severe braking condition
involving the use of the ABS, you will experience
some pedal drop as the vehicle comes to a stop.
This is the result of the system reverting to the
base brake system.
Engagement of the ABS may be accompanied
by a pulsing sensation. You may also hear a
clicking noise. These occurrences are normal
and indicate that the system is functioning
properly.
WARNING!
The ABS contains sophisticated electronic
equipment that may be susceptible to inter
-
ference caused by improperly installed or
high output radio transmitting equipment.
This interference can cause possible loss of
anti-lock braking capability. Installation of
such equipment should be performed by
qualified professionals.
Pumping of the Anti-Lock Brakes will
diminish their effectiveness and may lead
to a collision. Pumping makes the stopping
distance longer. Just press firmly on your
brake pedal when you need to slow down or
stop.
The ABS cannot prevent the natural laws of
physics from acting on the vehicle, nor can
it increase braking or steering efficiency
beyond that afforded by the condition of the
vehicle brakes and tires or the traction
afforded.
The ABS cannot prevent collisions,
including those resulting from excessive
speed in turns, following another vehicle
too closely, or hydroplaning.
The capabilities of an ABS equipped vehicle
must never be exploited in a reckless or
dangerous manner that could jeopardize
the user’s safety or the safety of others.
WARNING!
(Continued)
20_VF_OM_EN_US_t.book Page 56

SAFETY57
Electronic Brake Control (EBC) System
Your vehicle is equipped with an advanced Elec -
tronic Brake Control (EBC) system that includes
the Traction Control System (TCS), Brake Assist
System (BAS) and Electronic Stability Control
(ESC), Trailer Sway Control (TSC), and Hill Start
Assist (HSA). These systems complement the
Anti-Lock Brake System (ABS) by optimizing the
vehicle braking capability during emergency
braking maneuvers.
Brake Assist System (BAS)
The Brake Assist Sys tem (BAS) is designed to
optimize the vehicle’s braking c apability
during e merg ency braking maneuvers. The
system detects an emergency braking situa -
tio n by sensing the rate and am ount of brake
applic ation and then applies optimum pres -
sure to the brakes. This can help reduce
braking distance s. The BAS complements
the Anti-Lock Brake System (ABS). Applying
the brakes very quickly res ults in the best
BAS assistance . To rec eive the be ne fit of the
system , yo u must apply continuous braking pressure during the stopping sequence (do
not “pum p” the brakes). Do not reduce brake
pedal pre ssure unless braking is no longer
desired. Onc e the brake pedal is released,
the BAS is deac tivated.
Electronic Stability Control (ESC)
The Electronic Stability Control (ESC) enhances
directional control and stability of the vehicle
under various driving conditions. ESC corrects
for over/under steering of the vehicle by
applying the brake of the appropriate wheel to
assist in counteracting the over/under steer
condition. Engine power may also be reduced to
help the vehicle maintain the desired path.
ESC uses sensors in the vehicle to determine
the vehicle path intended by the driver and
compares it to the actual path of the vehicle.
When the actual path does not match the
intended path, ESC applies the brake of the
appropriate wheel to assist in counteracting the
oversteer or understeer condition.
Oversteer - when the vehicle is turning more
than appropriate for the steering wheel posi
-
tion.
Understeer - when the vehicle is turning
less than appropriate for the steering
wheel position.
WARNING!
The Brake Assist System (BAS) cannot
prevent the natural laws of physics from
acting on the vehicle, nor can it increase the
traction afforded by prevailing road
conditions. BAS cannot prevent collisions,
including those resulting from excessive
speed in turns, driving on very slippery
surfaces, or hydroplaning. The capabilities of
a BAS-equipped vehicle must never be
exploited in a reckless or dangerous manner,
which could jeopardize the user's safety or
the safety of others.
4

20_VF_OM_EN_US_t.book Page 57

60SAFETY
(Continued)

Hill Start Assist (HSA)
The Hill Start Assist (HSA) system is designed to
assist the driver when starting a vehicle from a stop
on a hill. HSA will maintain the level of brake pres -
sure the driver applied for a short period of time
after the driver takes their foot off of the brake
pedal. If the driver does not apply the throttle during
this short period of time, the system will release
brake pressure and the vehicle will roll down the hill.
The system will release brake pressure in proportion
to the amount of throttle applied as the vehicle
starts to move in the intended direction of travel.
HSA Activation Criteria
The following criteria must be met in order for HSA
to activate:
Vehicle must be stopped
Vehicle must be on a 6% (approximate) grade or
greater hill
Gear selection matches vehicl e uphill direction
(i.e., vehicle facing uphill is in forward gear;
vehicle backing uphill is in REVERSE (R) gear)
HSA will work in REVERSE and all forward gears
when the activation criteria have been met. The
system will not activate if the vehicle is placed in
NEUTRAL (N) or PARK (P).

Towing With HSA
HSA will also provide assistance to mitigate roll
back while towing a trailer.
Traction Control System (TCS)
The Traction Control System (TCS) monitors the
amount of wheel spin of each of the driven
wheels. If wheel spin is detected, brake pressure
is applied to the slipping wheel(s) and engine
power is reduced, to provide enhanced accelera -
tion and stability. A feature of the TCS system,
Brake Limited Differential (BLD), functions
similar to a limited slip differential and controls
the wheel spin across a driven axle. If one wheel
on a driven axle is spinning faster than the other,
the system will apply the brake of the spinning
wheel. This will allow more engine torque to be
applied to the wheel that is not spinning. This
feature remains active even if the ESC is in the
“Partial Off” mode.

WARNING!
There may be situations on minor hills with
a loaded vehicle, or while pulling a trailer,
when the system will not activate and slight
rolling may occur. This could cause a
collision with another vehicle or object.
Always remember the driver is responsible
for braking the vehicle.
WARNING!
If you use a trailer brake controller with
your trailer, the trailer brakes may be acti -
vated and deactivated with the brake
switch. If so, there may not be enough
brake pressure to hold both the vehicle
and the trailer on a hill when the brake
pedal is released. In order to avoid rolling
down an incline while resuming accelera -
tion, manually activate the trailer brake
or apply more vehicle brake pressure
prior to releasing the brake pedal.
HSA is not a parking brake. Always apply
the parking brake fully when exiting your
vehicle. Also, be certain to place the trans -
mission in PARK.
Failure to follow these warnings can result
in a collision or serious personal injury.
WARNING!
(Continued)
20_VF_OM_EN_US_t.book Page 60

SAFETY61

The ESC Activation/Malfunction Indicator Light
(in the instrument cluster) will start to flash as
soon as the tires lose traction and the wheels
begin to spin. This indicates that the TCS is
active. If the indicator light flashes during accel -
eration, ease up on the accelerator and apply as
little throttle as possible. Be sure to adapt your
speed and driving to the prevailing road condi -
tions, and do not switch off the ESC or TCS.

Trailer Sway Control (TSC) — If Equipped
Trailer Sway Control (TSC) uses sensors in the
vehicle to recognize an excessively swaying
trailer and will take the appropriate actions to
attempt to stop the sway. The system may reduce engine power and apply the brake of
the appropriate wheel(s) to counteract the
sway of the trailer. TSC will become active
automatically once an excessively swaying
trailer is recognized.
NOTE:
TSC cannot stop all trailers from swaying.
Always use caution when towing a trailer and
follow the trailer tongue weight recommenda
-
tions. Refer to “Trailer Towing” in “Starting And
Operating” for further information.
When TSC is functioning, the ESC Activation/
Malfunction Indicator Light will flash, the engine
power may be reduced, and you may feel the
brakes being applied to individual wheels to
attempt to stop the trailer from swaying. TSC is
disabled when the ESC system is in the “Partial
Off” mode.
AUXILIARY DRIVING SYSTEMS
Tire Pressure Monitoring System (TPMS)
The Tire Pressure Monitoring System (TPMS)
will warn the driver of a low tire pressure based
on the vehicle recommended cold placard pres -
sure.
The tire pressure will vary with temperature by
about 1 psi (7 kPa) for every 12°F (6.5°C). This
means that when the outside temperature
decreases, the tire pressure will decrease. Tire
pressure should always be set based on cold
inflation tire pressure. This is defined as the tire
pressure after the vehicle has not been driven
for at least three hours, or driven less than
1 mile (1.6 km) after a three hour period. The
cold tire inflation pressure must not exceed the
maximum inflation pressure molded into the
tire sidewall. Refer to “Tires” in “Servicing And
Maintenance” for information on how to prop -
erly inflate the vehicle’s tires. The tire pressure
will also increase as the vehicle is driven - this is
normal and there should be no adjustment for
this increased pressure.
WARNING!
The TCS cannot prevent the natural laws of
physics from acting on the vehicle, nor can
it increase the traction afforded.
The TCS cannot prevent collisions,
including those resulting from excessive
speed in turns, or hydroplaning.
The capabilities of a TCS-equipped vehicle
must never be exploited in a reckless or
dangerous manner, which could jeopardize
the user's safety or the safety of others.
WARNING!
If TSC activates while driving, slow the
vehicle down, stop at the nearest safe
location, and adjust the trailer load to
eliminate trailer sway.
4

20_VF_OM_EN_US_t.book Page 61

96STARTING AND OPERATING
NOTE:
You must press and hold the brake pedal while
shifting out of PARK.
Key Ignition Park Interlock
This vehicle is equipped with a Key Ignition Park
Interlock which requires the transmission to be
in PARK before the ignition can be turned to the
LOCK/OFF (key removal) position. The key can
only be removed from the ignition when the igni -
tion is in the LOCK/OFF position, and once
removed the transmission is locked in PARK. NOTE:
If a malfunction occurs, the system will trap the
key in the ignition to warn you that this safety
feature is inoperable. The engine can be started
and stopped but the key cannot be removed
until you obtain service.
Brake/Transmission Shift Interlock System
This vehicle is equipped with a Brake Transmis
-
sion Shift Interlock System (BTSI) that holds the
transmission gear selector in PARK unless the
brakes are applied. To shift the transmission
out of PARK, the ignition must be turned to the
ON/RUN mode (engine running or not), and the
brake pedal must be pressed.
NOTE:
Swivel seats that are unlocked can also prevent
the transmission gear selector from being
moved out of the PARK position. To shift the
transmission out of the PARK position the first
time after cranking is allowed, ensure swivel
seats are locked in the forward facing position.
Six-Speed Automatic Transmission
The transmission gear position display (located
in the instrument cluster) indicates the trans -
mission gear range. You must press the brake
pedal to move the gear selector out of PARK
(Refer to “Brake/Transmission Shift Interlock
System” in this section). To drive, move the gear
selector from PARK or NEUTRAL to the DRIVE
position.
The electronically-controlled transmission
provides a precise shift schedule. The transmis -
sion electronics are self-calibrating; therefore,
the first few shifts on a new vehicle may be
somewhat abrupt. This is a normal condition,
and precision shifts will develop within a few
hundred miles (kilometers).
Gear SelectorCAUTION!
Shift into or out of PARK or REVERSE only
after the vehicle has come to a complete
stop.
Do not shift between PARK, REVERSE,
NEUTRAL, or DRIVE when the engine is
above idle speed.
Before shifting into any gear, make sure
your foot is firmly pressing the brake pedal.

20_VF_OM_EN_US_t.book Page 96

STARTING AND OPERATING113
The best way to figure out the total weight of
your vehicle is to weigh it when it is fully loaded
and ready for operation. Weigh it on a commer -
cial scale to ensure that it is not over the GVWR.
Figure out the weight on the front and rear axle
of the vehicle separately. It is important that you
distribute the load evenly over the front and rear
axles.
Overloading can cause potential safety hazards
and shorten useful service life. Heavier axles or
suspension components do not necessarily
increase the vehicle's GVWR.
Loading
To load your vehicle properly, first figure out its
empty weight, axle-by-axle and side-by-side.
Store heavier items down low and be sure you
distribute their weight as evenly as possible.
Stow all loose items securely before driving. If
weighing the loaded vehicle shows that you
have exceeded either Gross Axle Weight Rating
(GAWR), but the total load is within the specified
Gross Vehicle Weight Rating (GVWR), you must
redistribute the weight. Improper weight distri -
bution can have an adverse effect on the way
your vehicle steers and handles and the way the
brakes operate. NOTE:
Refer to the “Vehicle Certification Label” affixed
to the rear of the driver's door for your vehicle's
GVWR and GAWRs.
TRAILER TOWING
In this section you will find safety tips and infor
-
mation on limits to the type of towing you can
reasonably do with your vehicle. Before towing a
trailer, carefully review this information to tow
your load as efficiently and safely as possible.
To maintain the New Vehicle Limited Warranty
coverage, follow the requirements and recom -
mendations in this manual concerning vehicles
used for trailer towing.
Common Towing Definitions
The following trailer towing related definitions
will assist you in understanding the following
information:
Gross Vehicle Weight Rating (GVWR)
The Gross Vehicle Weight Rating (GVWR) is the
total allowable weight of your vehicle. This
includes driver, passengers, cargo and tongue
weight. The total load must be limited so that you do not exceed the GVWR. Refer to “Vehicle
Loading/Vehicle Certification Label” in “Starting
And Operating” for further information.
Gross Combination Weight Rating (GCWR)
The Gross Combination Weight Rating (GCWR)
is the total allowable weight of your vehicle and
trailer when weighed in combination.
Gross Trailer Weight (GTW)
The Gross Trailer Weight (GTW) is the weight of
the trailer plus the weight of all cargo, consum
-
ables and equipment (permanent or temporary)
loaded in or on the trailer in its “loaded and
ready for operation” condition.
The recommended way to measure GTW is to
put your fully loaded trailer on a vehicle scale.
The entire weight of the trailer must be
supported by the scale.
Gross Axle Weight Rating (GAWR)
The Gross Axle Weight Rating (GAWR) is the
maximum capacity of the front and rear axles.
Distribute the load over the front and rear axles
evenly. Make sure that you do not exceed either
front or rear GAWR. Refer to “Vehicle Loading/
Vehicle Certification Label” in “Starting And
Operating” for further information.
5

20_VF_OM_EN_US_t.book Page 113

114STARTING AND OPERATING
Tongue Weight (TW)
The Tongue Weight (TW) is the downward force
exerted on the hitch ball by the trailer. You must
consider this as part of the load on your vehicle.
Trailer Frontal Area
The frontal area is the maximum height multi -
plied by the maximum width of the front of a
trailer.
Trailer Sway Control
The Trailer Sway Control (TSC) can be a
mechanical telescoping link that can be
installed between the hitch receiver and the
trailer tongue that typically provides adjustable
friction associated with the telescoping motion
to dampen any unwanted trailer swaying
motions while traveling. If equipped, the electronic TSC recognizes a
swaying trailer and automatically applies indi
-
vidual wheel brakes and/or reduces engine
power to attempt to eliminate the trailer sway.
Weight-Carrying Hitch
A weight-carrying hitch supports the trailer
tongue weight, just as if it were luggage located
at a hitch ball or some other connecting point of
the vehicle. These kinds of hitches are the most
popular on the market today and they are
commonly used to tow small and medium sized
trailers.
Weight-Distributing Hitch
A weight-distributing system works by applying
leverage through spring (load) bars. They are
typically used for heavier loads to distribute
trailer tongue weight to the tow vehicle's front
axle and the trailer axle(s). When used in accor -
dance with the manufacturer's directions, it
provides for a more level ride, offering more
consistent steering and brake control thereby
enhancing towing safety. The addition of a fric -
tion/hydraulic sway control also dampens sway
caused by traffic and crosswinds and contrib -
utes positively to tow vehicle and trailer
stability. Trailer sway control and a weight distributing (load equalizing) hitch are recom
-
mended for heavier Tongue Weights (TW) and
may be required depending on vehicle and
trailer configuration/loading to comply with
Gross Axle Weight Rating (GAWR) requirements.
Trailer Hitch Classification
The following chart provides the industry stan -
dard for the maximum trailer weight a given
trailer hitch class can tow and should be used to
assist you in selecting the correct trailer hitch
for your intended towing condition.
WARNING!
It is important that you do not exceed the
maximum front or rear GAWR. A dangerous
driving condition can result if either rating is
exceeded. You could lose control of the
vehicle and have a collision.
WARNING!
An improperly adjusted Weight Distributing
Hitch system may reduce handling,
stability, braking performance, and could
result in a collision.
Weight Distributing Systems may not be
compatible with Surge Brake Couplers.
Consult with your hitch and trailer manufac -
turer or a reputable Recreational Vehicle
dealer for additional information.

20_VF_OM_EN_US_t.book Page 114