2022 CADILLAC CT4 brake light

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-15283641) -
2022 - CRC - 10/12/21
102 INSTRUMENTS AND CONTROLS
SeeTowing the Vehicle (Electronic
Shifter) 0393 or
Towing the Vehicle (Mechanical Shifter)
0 395.
{Warning
The brake system might not be
working properly if the brake
system warning light is on. Driving
with the brake system warning light
on can lead to a crash. If the light is
still on after the vehicle has been
pulled off the road and carefully
stopped, have the vehicle towed for
service.
Electric Parking Brake
Light
MetricEnglish
This light comes on when the parking
brake is applied. If the light continues
flashing after the parking brake is released, or while driving, there is a
problem with the Electric Parking
Brake system. A message may also
display in the Driver Information
Center (DIC).
If the light does not come on,
or remains flashing, see your dealer.
Service Electric Parking
Brake Light
This light may come on briefly when
the vehicle is turned on. If it does not
come on, have it fixed so it will be
ready to warn if there is a problem.
If this light stays on or comes on
while driving, there is a problem with
the Electric Parking Brake (EPB). Take
the vehicle to a dealer as soon as
possible. In addition to the parking
brake, other safety functions that
utilize the EPB may also be degraded.
A message may also display in the
Driver Information Center (DIC). See
Electric Parking Brake
0254.
Antilock Brake System
(ABS) Warning Light
This warning light should come on
briefly when the vehicle is turned on.
If the light does not come on, have it
fixed so it will be ready to warn if
there is a problem.
If the light comes on while driving,
safely stop as soon as it is possible
and turn off the vehicle. Then turn on
the vehicle again to reset the system.
If the ABS warning light stays on,
or comes on again while driving, the
vehicle needs service. A chime may
also sound when the light stays on.
If the ABS warning light is the only
light on, the vehicle has regular
brakes, but ABS is not functioning.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-15283641) -
2022 - CRC - 10/12/21
INSTRUMENTS AND CONTROLS 103
If both the ABS warning light and the
brake system warning light are on,
ABS is not functioning and there is a
problem with the regular brakes. See
your dealer for service.
SeeBrake System Warning Light 0101.
Performance Shifting Light
If equipped, this light may display
green when Sport Mode is activated
and certain driving conditions are
met. Sport Mode detects when the
vehicle is being driven in a
competitive manner, and adjusts the
shifting of the gears accordingly. See
Driver Mode Control 0258.
Automatic Vehicle Hold
(AVH) Light
This light comes on when AVH is
turned on. See Automatic Vehicle Hold
(AVH) 0256.
Lane Keep Assist (LKA)
Light
Base LevelUplevel
If equipped, this light is white if LKA
is turned on, but not ready to assist.
This light is green if LKA is turned on
and is ready to assist. LKA may assist by gently turning the
steering wheel if the vehicle
approaches a detected lane marking.
The LKA light is amber when
assisting.
This light flashes amber as a Lane
Departure Warning (LDW) alert, to
indicate that the lane marking has
been unintentionally crossed. If the
system detects that the vehicle has
been steered intentionally across a
lane marker, the LDW may not be
given. Do not expect the LDW to
occur when intentionally crossing the
lane marker.
LKA will not assist or alert if the turn
signal is active in the direction of lane
departure, or if LKA detects that you
are accelerating, braking, or actively
steering.
See
Lane Keep Assist (LKA) 0309.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-15283641) -
2022 - CRC - 10/12/21
INSTRUMENTS AND CONTROLS 119
The windshield is part of the HUD
system. If windshield replacement is
required, seeWindshield Replacement
0 351.
Vehicle Messages
Messages displayed on the Driver
Information Center (DIC) indicate the
status of the vehicle or some action
that may be needed to correct a
condition. Multiple messages may
appear one after another.
The messages that do not require
immediate action can be
acknowledged and cleared by pressing
the thumbwheel. The messages that
require immediate action cannot be
cleared until that action is performed.
All messages should be taken
seriously; clearing the message does
not correct the problem.
If a SERVICE message appears, see
your dealer. Follow the instructions given in the
messages. The system displays
messages regarding the following
topics:
.Service Messages
.Fluid Levels
.Vehicle Security
.Brakes
.Steering
.Ride Control Systems
.Driver Assistance Systems
.Cruise Control
.Lighting and Bulb Replacement
.Wiper/Washer Systems
.Doors and Windows
.Seat Belts
.Airbag Systems
.Engine and Transmission
.Tire Pressure
.Battery
Engine Power Messages
REDUCED ACCELERATION DRIVE
WITH CARE
This message displays when the
vehicle's propulsion power is reduced.
A reduction in propulsion power can
affect the vehicle's ability to
accelerate. If this message is on, but
there is no observed reduction in
performance, proceed to your
destination. Under certain conditions
the performance may be reduced the
next time the vehicle is driven. The
vehicle may be driven while this
message is on, but maximum
acceleration and speed may be
reduced. Anytime this message stays
on, or displays repeatedly, the vehicle
should be taken to your dealer for
service as soon as possible.
Under certain operating conditions,
propulsion will be disabled. Try
restarting after the ignition has been
off for two minutes.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-15283641) -
2022 - CRC - 10/12/21
DRIVING AND OPERATING 217
fluid is over a month old or unknown,
replace the brake fluid before track
events and competitive driving. Do
not use silicone or DOT 5 brake fluids.
Disconnect the battery before bleeding
the system, replacing the pads, or any
other work. The battery must be
disconnected to prevent the brake
master cylinder from pressurizing the
hydraulic system during its automated
self diagnostic tests that may occur
when a door is opened or the remote
key is present.
Check the fluid level before each
competitive driving event.
Brake System Flushing & Bleeding
The J55 brake system requires specific
processes for bleeding and fluid
flushing. These can be found in the
service manual.
Properly bleeding the brake system is
required for proper operation of the
hydraulic brake system.
Brake Leak Detection
The hydraulic braking system has
advanced diagnostic capability to help
detect hydraulic leaks, trapped air,and other performance issues. These
diagnostics are active when the
hydraulic system is powered. In order
to avoid inadvertently setting a leak
Diagnostic Trouble Code (DTC),
disconnect the battery before
servicing the brake system.
If the vehicle sets a DTC related to a
brake system leak, the Brake System
Warning Light will come on and
vehicle speed may be limited to
100 kph (62 mph). Any time a leak
DTC is set, the vehicle should be
inspected carefully for evidence of a
leak and should be repaired
immediately. See your dealer.
Brake Fade Warning Assist
The Brake Fade Warning Assist
system monitors the performance of
the brake system. If the system
detects brake fade, or if the brake
fluid is near the boiling point, the
driver will be alerted.
The Brake Fade Warning Assist
system is designed for use with the
factory-installed brake pads or GM
approved replacement pads. If the
brake pads on the vehicle need to be
replaced, use GM approved brakepads. If this is not done, the brake
fade warning system may not function
properly.
Stage 1 :
The DIC displays a “Reduce
Braking to Avoid Overheating”
message, a chime sounds and brake
pedal effort and travel is increased.
When the message displays, the driver
should back up braking points and
reduce brake usage in order to reduce
brake temperature. This will allow for
continued lapping with no speed
limitations.
Stage 2 : The DIC displays a Brakes
Overheated Service Now message, a
chime sounds, and brake pedal effort
and travel is further increased. This
code indicates that the brake fluid
temperature is excessive and is about
to boil. The system limits vehicle
speed to 100 km/h (62 mph). The
driver should immediately start a cool
down lap if on the track. If this
message displays, the vehicle needs to
be serviced. The brake system needs
to cool down, and the brake fluid
must be immediately flushed with
DOT 4 for street use, or to a qualified

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-15283641) -
2022 - CRC - 10/12/21
DRIVING AND OPERATING 219
3. Repeat the first two steps 20consecutive times, this should take
about five minutes.
4. After completing the 20 stops, cool the brakes by driving for 8 km
(5 mi) at 100 km/h (60 mph).
Alternative Closed Course Brake
Burnishing Procedure
This brake burnish procedure should
only be run on vehicles with a factory
equipped brake system.
This procedure should only be run on
a track and only on dry pavement.
Brake pedal fade will occur during this
track burnish procedure and can
cause brake pedal travel and force to
increase. This could extend stopping
distance until the brakes are fully
burnished. 1. Start track lapping at lower speeds and lower braking efforts for
three minutes of driving. Allow for
increased braking distances due to
reduced brake output.
2. After Step 1, increase speed and braking effort for the next six
minutes of lapping, gradually
ending up at 90% effort. Continue to allow for increased braking
distance due to reduced brake
output.
3. Cool the brakes by lapping with minimal light braking for six
minutes.
As with all high performance brake
systems, some amount of brake squeal
is normal.
Suspension
Track Prep —Camber Set
To achieve the maximum camber
setting for track use, follow this
procedure prior to the final track
alignment.
1. Remove the Upper Radiator Baffle and both front shock tower braces.
2. Remove the strut rebound stop.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-15283641) -
2022 - CRC - 10/12/21
DRIVING AND OPERATING 225
{Warning
Wet brakes can cause crashes. They
might not work as well in a quick
stop and could cause pulling to one
side. You could lose control of the
vehicle.
After driving through a large puddle
of water or a car/vehicle wash,
lightly apply the brake pedal until
the brakes work normally.
Flowing or rushing water creates
strong forces. Driving through
flowing water could cause the
vehicle to be carried away. If this
happens, you and other vehicle
occupants could drown. Do not
ignore police warnings and be very
cautious about trying to drive
through flowing water.
Caution
Driving through deep puddles or
standing water can cause water to
come in through the engine air
intake and damage the engine.(Continued)
Caution (Continued)
If deep puddles or standing water
cannot be avoided, proceed with
caution and do not exceed 8 km/h
(5 mph). Do not drive through
water that may come close to or
cover the vehicle’s underbody.
Hydroplaning
Hydroplaning is dangerous. Water can
build up under the vehicle's tires so
they actually ride on the water. This
can happen if the road is wet enough
and you are going fast enough. When
the vehicle is hydroplaning, it has
little or no contact with the road.
There is no hard and fast rule about
hydroplaning. The best advice is to
slow down when the road is wet.
Other Rainy Weather Tips
Besides slowing down, other wet
weather driving tips include:
.Allow extra following distance.
.Pass with caution.
.Keep windshield wiping equipment
in good shape.
.Keep the windshield washer fluid
reservoir filled.
.Have good tires with proper tread
depth. SeeTires0363.
.Turn off cruise control.
Hill and Mountain Roads
Driving on steep hills or through
mountains is different than driving on
flat or rolling terrain. Tips include:
.Keep the vehicle serviced and in
good shape.
.Check all fluid levels and brakes,
tires, and cooling system.
.Shift to a lower gear when going
down steep or long hills.
{Warning
Using the brakes to slow the vehicle
on a long downhill slope can cause
brake overheating, can reduce brake
performance, and could result in a
loss of braking. Shift the
transmission to a lower gear to let
the engine assist the brakes on a
steep downhill slope.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-15283641) -
2022 - CRC - 10/12/21
DRIVING AND OPERATING 233
antenna signal causing interference to
the Keyless Access system. SeeRemote
Keyless Entry (RKE) System Operation
0 7.
To shift out of P (Park), the vehicle
must be on and the brake pedal must
be applied.
Stopping the Engine/OFF (No
Indicator Lights) : When the vehicle
is stopped, press ENGINE START/
STOP once to turn the engine off.
If the vehicle is in P (Park), the
ignition will turn off, and Retained
Accessory Power (RAP) will remain
active. See Retained Accessory Power
(RAP) 0237.
If the vehicle has an automatic
transmission, and is not in P (Park),
the ignition will return to ACC/
ACCESSORY and display a message in
the Driver Information Center (DIC).
When the vehicle is shifted into
P (Park), the ignition system will
turn OFF.
If the vehicle has a manual
transmission and is stationary, the
ignition will turn off, and Retained Accessory Power (RAP) will remain
active. See
Retained Accessory Power
(RAP) 0237.
The vehicle may have an electric
steering column lock. The lock is
activated when the vehicle is switched
to OFF and the driver door is opened.
A sound may be heard as the lock
actuates or releases. The steering
column lock may not release with the
wheels turned off center. If this
happens, the vehicle may not start.
Move the steering wheel from left to
right while attempting to start the
vehicle. If this does not work, the
vehicle needs service.
Do not turn the engine off when the
vehicle is moving. This will cause a
loss of power assist in the brake and
steering systems and disable the
airbags.
If the vehicle must be shut off in an
emergency: 1. Brake using a firm and steady pressure. Do not pump the brakes
repeatedly. This may deplete power
assist, requiring increased brake
pedal force. 2. Shift the vehicle to N (Neutral).
This can be done while the vehicle
is moving. After shifting to
N (Neutral), firmly apply the brakes
and steer the vehicle to a safe
location.
3. Come to a complete stop. Shift to P (Park) with an automatic
transmission, or Neutral with a
manual transmission. Turn the
ignition off.
4. Set the parking brake. See Electric
Parking Brake 0254.
{Warning
Turning off the vehicle while
moving may cause loss of power
assist in the brake and steering
systems and disable the airbags.
While driving, only shut the vehicle
off in an emergency.
If the vehicle cannot be pulled over,
and must be shut off while driving,
press and hold ENGINE START/STOP
for longer than two seconds, or press
twice within five seconds.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-15283641) -
2022 - CRC - 10/12/21
234 DRIVING AND OPERATING
ACC/ACCESSORY (Amber Indicator
Light) :This mode allows the use of
some electrical accessories when the
engine is off.
With the ignition off, pressing the
button one time without the brake
pedal applied will place the ignition
system in ACC/ACCESSORY.
The ignition will switch from
ACC/ACCESSORY to OFF after
five minutes to prevent battery
rundown.
ON/RUN/START (Green Indicator
Light) : This mode is for driving and
starting. With the ignition off, and the
brake pedal applied, pressing the
button once will place the ignition
system in ON/RUN/START. Once
engine cranking begins, release the
button. Engine cranking will continue
until the engine starts. See Starting the
Engine 0234. The ignition will then
remain on.
Service Mode
This power mode is available for
service and diagnostics, and to verify
the proper operation of the
malfunction indicator lamp as may be required for emission inspection
purposes. With the vehicle off, and the
brake pedal not applied, pressing and
holding ENGINE START/STOP for
more than five seconds will place the
vehicle in Service Mode. The
instruments and audio systems will
operate as they do in ON/RUN, but
the vehicle will not be able to be
driven. The engine will not start in
Service Mode. Press the button again
to turn the vehicle off.
Starting the Engine
Place the transmission in the
proper gear
Caution
If you add electrical parts or
accessories, you could change the
way the engine operates. Any
resulting damage would not be
covered by the vehicle warranty. See
Add-On Electrical Equipment
0321. Automatic Transmission
Move the shift lever to P (Park) or
N (Neutral). To restart the vehicle
when it is already moving, use
N (Neutral) only.
Caution
Do not try to shift to P (Park) if the
vehicle is moving. If you do, you
could damage the transmission.
Shift to P (Park) only when the
vehicle is stopped.
Manual Transmission
The shift lever should be in Neutral
and the parking brake engaged. Hold
the clutch pedal down to the floor,
press the brake pedal, and start the
engine.
Starting the Vehicle 1. For vehicles with an automatic transmission, press the brake pedal,
then press ENGINE START/STOP
on the instrument panel. For a
manual transmission, place the
shift lever in Neutral with the
parking brake engaged. Hold the