Acura RL (2011 year). Instruction — page 27

Your vehicle is equipped with disc
brakes at all four wheels. A power
assist helps reduce the effort needed
on the brake pedal. The brake pedal
assist function increases the force
you apply to the brake pedal during
an emergency stop. When the brake
pedal assist is activated, the e-
pretensioners (if equipped) tighten
front seat belts (see page

). The

anti-lock brake system (ABS) helps
you retain steering control when
braking very hard (see page

).

Resting your foot on the pedal keeps
the brakes applied lightly, builds up
heat, reduces their effectiveness and
reduces brake pad life. In addition,
fuel economy can be reduced. It also
keeps your brake lights on all the
time, confusing drivers behind you.

The hydraulic system that operates
the brakes has two separate circuits.
Each circuit works diagonally across
the vehicle (the left-front brake is
connected with the right-rear brake,
etc.). If one circuit should develop a
problem, you will still have braking
at two wheels.

Constant application of the brakes
when going down a long hill builds
up heat and reduces their effective-
ness. Use the engine to assist the
brakes by taking your foot off the
accelerator and downshifting to a
lower gear.

Check the brakes after driving
through deep water. Apply the
brakes moderately to see if they feel
normal. If not, apply them gently and
frequently until they do. Be extra
cautious in your driving.

If the brake pads need replacing, you
will hear a distinctive, metallic
screeching sound when you apply
the brake pedal. If you do not have
the brake pads replaced, they will
screech all the time. It is normal for
the brakes to occasionally squeal or
squeak when you apply them.

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416

Braking System Design

Brake Pad Wear Indicators

Braking System

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The anti-lock brake system (ABS)
helps prevent the wheels from
locking up, and helps you retain
steering control by pumping the
brakes rapidly, much faster than a
person can do it.

If this indicator comes on, the anti-
lock function of the braking system
has shut down. The brakes still work
like a conventional system, but
without anti-lock. You should have
your dealer inspect your vehicle as
soon as possible.

You will feel a pulsation in the brake
pedal when the ABS activates, and
you may hear some noise. This is
normal: it is the ABS rapidly
pumping the brakes. On dry
pavement, you will need to press on
the brake pedal very hard before the
ABS activates. However, you may
feel the ABS activate immediately if
you are trying to stop on snow or ice.

Let the ABS work for you by always
keeping firm, steady pressure on the
brake pedal. This is sometimes
referred to as ‘‘stomp and steer.’’

The electronic brake distribution
(EBD) system, which is part of the
ABS, also balances the front-to-rear
braking distribution according to
vehicle loading.

When the ABS indicator comes on,
you will also see a ‘‘CHECK ABS
SYSTEM’’ message on the multi-
information display.

If the ABS indicator comes on while
driving, test the brakes as shown on
page

.

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You should never pump the brake pedal.

ABS Indicator

Anti-lock Brakes (ABS)

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on loose or

uneven surfaces, such as gravel or
snow, than a vehicle without anti-
lock.

It only helps with steering

control during braking.

such as trying to take a

corner too fast or making a sudden
lane change. Always drive at a safe
speed for the road and weather
conditions.

Always steer moderately

when you are braking hard. Severe
or sharp steering wheel movement
can still cause your vehicle to veer
into oncoming traffic or off the road.

If the ABS indicator and the brake
system indicator come on together,
and the parking brake is fully
released, the EBD system may also
be shut down.

Test your brakes as instructed on
page

. If the brakes feel normal,

drive slowly and have your vehicle
repaired by your dealer as soon as
possible. Avoid sudden hard braking
which could cause the rear wheels to
lock up and possibly lead to a loss of
control.

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A vehicle with ABS may require a
longer distance to stop

Important Saf ety Reminders
ABS does not reduce the time or
distance it takes to stop the
vehicle.

ABS will not prevent a skid that
results f rom changing direction
abruptly,

ABS cannot prevent the loss of
stability.

Anti-lock Brakes (ABS)

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If equipped

The collision mitigation braking
system

(CMBS ) can assist the

driver when there is a possibility of
colliding with the vehicle in front of
yours. It is designed to reduce the
speed of your vehicle before an
unavoidable collision occurs and, if
possible, to alert you to a potential
collision while there is time for the
driver to prevent it. Here is a brief
description of what the CMBS can
do:

When your speed is above 10 mph
(15 km/h), the CMBS is monitoring
the vehicle ahead of you with radar.
When your vehicle is approaching
the vehicle ahead of yours too
quickly, the system may activate one
or more of the following: a visual
alert, an audible alert, apply the
brakes and e-pretensioners to
tighten the front seat belts

first as

a warning, then to prepare for an
impending crash (see page

).

The CMBS consists of a radar
sensor in the front grille, a brake
actuator in the engine compartment,
an indicator on the instrument panel,
seat belt e-pretensioners on the front
seats, and an on/off button on the
dashboard.

24

Collision Mitigation Braking System (CMBS )

Overview

418

RADAR SENSOR

BRAKE
ACTUATOR

SEAT BELT
e-PRETENSIONERS

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The radar sensor is located under
the Acura emblem in the front grille.
If the radar sensor cover is covered
with mud, dirt, dead leaves, wet
snow, etc., or if you put a sticker on
it, the CMBS will automatically shut
off, and the CMBS indicator on the
instrument panel will come on. You
will also see a ‘‘CHECK CMBS
RADAR SENSOR’’ message on the
multi-information display for about 5
seconds.

There are three bolts on the sides of
the radar sensor. Do not tamper with
these bolts, or you may cause the
system to malfunction.

Always keep the radar sensor cover
clean. If it gets dirty, clean it with
water or a mild detergent. Never use
chemical solvents or polishing
powder.

CONTINUED

Radar Sensor

Collision Mitigation Braking System (CMBS )

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RADAR SENSOR COVER

BOLTS
(Do not tamper)

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Certain conditions may cause the
radar aim to be temporarily out of
proper range, such as the following
two examples:

If the radar sensor cover or the radar
sensor ever needs to be removed,
take your vehicle to a dealer.

Do not allow anything to impact the
radar sensor or the radar sensor
cover. If either of these parts
receives a strong impact, switch the
system off by pressing the CMBS
OFF button, and have your vehicle
checked by a dealer. If the front
grille ever needs to be repaired,
consult a dealer first.

The tires are not correctly
maintained. Always make sure the
tire pressures are correct (see
page

), and that the tires are

the correct size and in good
condition (see Tires on page

).

Your vehicle is tilted because of a
heavy load in the rear or from
modifications to the suspension.
Do not overload your vehicle (see
Carrying Cargo on page

), and

do not make any modifications to
the suspension (see Accessories
and Modifications on page

).

394

392

482

481

Collision Mitigation Braking System (CMBS )

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When the CMBS is on, the radar sensor
constantly scans f or vehicles directly
ahead of you. This means that driving
on a road with a f ew or no vehicles
could cause a CHECK CMBS RADAR
SENSOR message to appear on the
multi-inf ormation display. This is
normal and not a cause f or concern.

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CONTINUED

If the system senses a likely collision
with a vehicle or object ahead of you,
it alerts you with a visual alert or a
combination of a visual alert and an
audible alert.

The visual alert is an amber colored
BRAKE message that flashes on the
multi-information display, the audible
alert is a constant beeping sound. If
one or more of the alerts come on,
take the appropriate means to
prevent a collision (apply the brakes,
change lanes, etc.).

Collision Alarm

Collision Mitigation Braking System (CMBS )

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e-pretensioner

The radar sensor

detects a vehicle.

Braking

Audio & Visual

WARNING

Stage one

Stage three

Distance between vehicles

CMBS

Stage two

Retracts the driver’s

seat belt gently a few

times, providing a

physical warning.

Forcefully tightens

driver and front

passenger seat belts.

There is a risk of a

collision with the

vehicle ahead of you.

The risk of a collision

has increased, time to

respond is reduced.

The CMBS

determines that a

collision is

unavoidable.

Lightly

applied

Forcefully

applied

‘‘BRAKE’’ flashes

on the multi-

information

display.

A beep sounds

and ‘‘BRAKE’’

flashes on the

multi-information

display.

: Depending on the circumstances, CMBS may not go through all of the alert stages before initiating the last stage.

Collision Mitigation Braking System (CMBS )

422

YOUR
VEHICLE

YOUR
VEHICLE

YOUR
VEHICLE

VEHICLE
AHEAD

VEHICLE
AHEAD

VEHICLE
AHEAD

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Any of the conditions below can
cause the CMBS to shut off. When
the system shuts off, the CMBS
indicator in the instrument panel
comes on, and a CHECK CMBS
SYSTEM message appears on the
multi-information display for about 5
seconds.

An abnormal tire condition is
detected (wrong tire size, flat tire,
etc.).

Extended off-road or mountainous
driving.

Driving your vehicle with the
parking brake applied.

Driving your vehicle in bad
weather (rain, fog, snow, etc.).

A dirty radar sensor cover on the
front grille.

To switch the CMBS off, press the
CMBS OFF button on the dashboard
for about 1 second. When you do this,
a beeper sounds, a CMBS indicator
on the instrument panel comes on,
and a CMBS OFF message appears
on the multi-information display. To
switch the system back on, press the
button again for about 1 second.

When you turn the ignition switch to
the ON (II) position, the system will
be in the previously selected on or
off setting.

CONTINUED

Collision Mitigation Braking System (CMBS )

Automatic Shut Of f

CMBS OFF Button

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CMBS OFF BUTTON

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When the VSA system indicator
comes on (see page

).

The CMBS indicator normally comes
on under these conditions:

When you manually switch off the
system.

When the system shuts off
automatically.

When you drive in bad weather
(rain, snow, fog, etc.).

If anything covers the radar
sensor cover (dirt, mud, dry leaves,
wet snow, etc.).

The CMBS will automatically switch
on again if the conditions that caused
it to switch off are improved.

This indicator comes on for several
seconds when you turn the ignition
switch to the ON (II) position. It also
comes on and stays on when you
turn the CMBS off by pressing the
CMBS OFF button.

To switch the CMBS back on, make
sure the vehicle is stopped and the
ignition switch is in the ON (II)
position, then press the CMBS OFF
button for about 1 second.

435

CMBS Indicator

Collision Mitigation Braking System (CMBS )

424

CMBS INDICATOR

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CONTINUED

The CMBS may not activate under
some conditions. Here are a few
examples:

The distance between your vehicle
and the vehicle ahead of you is too
short.

When you turn the ignition switch
to the ON (II) position, the CMBS
indicator should come on for a few
seconds, then go off. If the
indicator comes on at any other
time and a CHECK CMBS
SYSTEM message appears on the
multi-information display, there is
a problem with the CMBS. You
can still drive your vehicle, but
CMBS will not be operating. Have
your vehicle checked by a dealer.

A vehicle cuts in front of you at a
slow speed, or it brakes suddenly.

When you accelerate rapidly and
approach the vehicle ahead of you
at high speed.

Immediately after you begin
driving.

Limitations

Collision Mitigation Braking System (CMBS )

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YOUR VEHICLE

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A vehicle suddenly crosses in front
of you.

The vehicle ahead of you is a
motorcycle or other small vehicle.

Driving in heavy, stop-and-go
traffic.

This system is designed to detect
and provide sufficient advanced
warning of a collision. As a result,
you may experience occasional false
activations.

When you change lanes quickly,
and go around the vehicle ahead
of you.

Even with little or no chance of a
collision, the CMBS may activate
under these conditions:

Collision Mitigation Braking System (CMBS )

426

YOUR VEHICLE

YOUR VEHICLE

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The CMBS is not designed to detect
pedestrians.

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When you approach train tracks.

When you pass a low bridge at
high speed.

When you go over a sharp-edged
speed bump at high speed.

When you go over areas of
construction on the road surface.

When you approach or pass a
vehicle ahead of you that is
turning left or right in an
intersection.

CONTINUED

Collision Mitigation Braking System (CMBS )

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LOW BRIDGE

RAILS

YOUR VEHICLE

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As required by the FCC:
This device complies with Part 15 of the
FCC rules. Operation is subject to the
following two conditions: (1) This device
may not cause harmful interference, and
(2) this device must accept any
interference received, including
interference that may cause undesired
operation.

Changes or modifications not expressly
approved by the party responsible for
compliance could void the user’s
authority to operate the equipment.

This device complies with Industry
Canada Standard RSS-210.
Operation is subject to the following two
conditions: (1) this device may not cause
interference, and (2) this device must
accept any interference that may cause
undesired operation of the device.

The main purpose of the CMBS is to
reduce the severity of injuries
caused by an unavoidable collision.
While the CMBS may help to alert
you and minimize the severity of a
collision, it may not activate in every
dangerous situation.

Even with the CMBS, it is still your
responsibility to operate the brake
pedal and steering wheel
appropriately, according to the
driving conditions.

Because of the road condition
(curved, winding, etc.) or the state of
your vehicle (turning angle, lane
position, etc.), CMBS can sometimes
mistake a stationary object (light
pole, traffic sign, guard rail, etc.) as a
vehicle ahead of you and temporarily
operate. This is normal.

Important Saf ety Reminder

Collision Mitigation Braking System (CMBS )

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YOUR VEHICLE

SIGN, POLE, etc.

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Your vehicle is equipped with a tire
pressure monitoring system (TPMS)
that turns on every time you start the
engine and monitors the pressure in
your tires while driving.

Each tire has its own pressure
sensor. If the air pressure of a tire
becomes significantly low, the
sensor in that tire immediately sends
a signal that causes the low tire
pressure/TPMS indicator in the
instrumental panel and the
appropriate tire position indicator on
the tire pressure monitor on the
multi-information display (see page

) to come on.

Refer to page

for tire inflation

guidelines.

If there is a problem with the TPMS,
this indicator begins to flash. It stops
flashing after approximately 1
minute, then stays on. You will also
see a ‘‘CHECK TPMS SYSTEM’’
message on the multi-information
display (see page

).

When the low tire pressure/TPMS
indicator is on, one or more of your
tires is significantly underinflated.
The multi-information display also
shows a ‘‘CHECK TIRE PRESSURE’’
message (see page

). You should

stop and check your tires as soon as
possible, and inflate them to the
proper pressure as indicated on the
vehicle’s tire information placard.

Driving on a significantly under
inflated tire causes the tire to
overheat and can lead to tire failure.
Underinflation also reduces fuel
efficiency and tire tread life, and may
affect the vehicle’s handling and
stopping ability.

Because tire pressure varies by
temperature and other conditions,
the low tire pressure/TPMS
indicator may come on unexpectedly.

For example, if you check and fill
your tires in a warm area, then drive
in extremely cold weather, the tire
pressure will be lower than
measured and could be underinflated
and cause the low tire pressure/
TPMS indicator to come on. Or, if
you check and adjust your tire
pressure in cooler conditions, and
drive into extremely hot conditions,
the tire may become overinflated.
However, the low tire pressure/
TPMS indicator will not come on if
the tires are overinflated.

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433

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Low Tire Pressure/
TPMS Indicator

Tire Pressure Monitoring System (TPMS)

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Although your tire pressure is
monitored, you must manually check
the tire pressures monthly.

Each tire, including the spare, should
be checked monthly when the
vehicle is cold, and set to the
recommended inflation pressure as
specified on the vehicle placard and
in the owner’s manual (see page

).

If the tire is flat, or if the tire
pressure is too low to continue
driving, replace the tire with the
compact spare tire (see page

).

If you think you can safely drive a
short distance to a service station,
proceed slowly to the station, then
inflate the tire to the recommended
pressure.

If you have a flat tire, the low tire
pressure/TPMS and tire monitor
indicators will come on. Replace the
indicated flat tire with the compact
spare tire (see page

).

After the flat tire is replaced with the
spare tire, the low tire pressure/
TPMS indicator stays on while
driving. After several miles
(kilometers) driving, this indicator
begins to flash, then stays on again.
You will also see a ‘‘CHECK TPMS
SYSTEM’’ message on the multi-
information display. This is normal;
the system cannot monitor the spare
tire pressure. Manually check the
spare tire pressure to be sure it is
correct.

This indicator and the warning
message on the multi-information
display will go off, after several miles
(kilometers) driving, when the spare
tire is replaced with the specified

regular tire equipped with the tire
pressure monitor sensor.

Never use a puncture-repairing agent
in a flat tire. If used, you will have to
replace the tire pressure sensor.
Have the flat tire repaired by your
dealer as soon as possible.

Each wheel is equipped with a tire
pressure sensor mounted inside the
tire behind the valve stem. You must
use TPMS specific wheels. It is
recommended that you always have
your tires serviced by your dealer or
a qualified technician.

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497

Changing a Tire with TPMS

Tire Pressure Monitoring System (TPMS)

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