INFORMATIONBEFOREDRIVINGYOURTOYOTA -> Brake system for Your Toyota 4 Runner SUV Fourth Generation (2003-2009)

07 12.25  
Iridiumtipped spark plugs  
(4.7 L V8 [2UZFE] engine)  
Brake system  
This brake system has 2 independent hy-  
draulic circuits. If either circuit should fail,  
the other will still work. However, the ped-  
al will be harder to press, and your stop-  
ping distance will increase. Also, the  
brake system warning light may come on.  
Depressing the brake pedal repeatedly  
may turn on the brake system warning  
light and buzzer. It is normal if the light  
turns off and the buzzer stops sounding  
after a few seconds.  
You may hear a small sound in the engine  
compartment after the engine is started or  
the brake pedal is depressed repeatedly.  
This is a pump pulsating sound of the  
brake system, and it is not a malfunction.  
CAUTION  
Do not drive your vehicle with only a  
single brake system. Have your  
brakes fixed immediately.  
CAUTION  
D Do not pump the brake pedal if the  
engine stalls. Each push on the  
pedal uses up your brake fluid  
pressure reserve.  
BRAKE BOOSTER  
Your engine is fitted with iridiumtipped  
spark plugs.  
The brake booster uses brake fluid pres-  
surized by the pump to powerassist the  
brakes. If the brake booster fails during  
driving, the brake system warning light  
comes on and buzzer sounds continuous-  
ly. In this case, the brakes may not work  
properly. If they do not work well, depress  
the brake pedal firmly. If the brake system  
warning light comes on, immediately stop  
your vehicle and contact your Toyota deal-  
er.  
NOTICE  
D Even if the power assist is com-  
pletely lost, the brakes will still  
work. But you will have to push the  
pedal hard, much harder than nor-  
mal. And your braking distance will  
increase.  
Use only iridiumtipped spark plugs.  
Do not adjust gaps for engine perfor-  
mance or smooth driveability.  
It is not a malfunction that the brake sys-  
tem warning light may stay on for 60 sec-  
onds after the engine switch is turned to  
the “ON” position.  
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07 12.25  
ANTILOCK BRAKE SYSTEM  
(with “ABS” warning light)  
Depressing the brake pedal on slippery  
road surfaces such as on a manhole cov-  
er, a steel plate at a construction site,  
joints in a bridge, etc. on a rainy day  
tends to activate the antilock brake sys-  
tem.  
CAUTION  
The antilock brake system is designed  
to help prevent lockup of the wheels  
during a sudden braking or braking on  
slippery road surfaces. This assists in  
providing directional stability and steer-  
ing performance of the vehicle under  
these circumstances.  
Do not overestimate the antilock  
brake system: Although the antilock  
brake system assists in providing ve-  
hicle control, it is still important to  
drive with all due care and maintain  
a moderate speed and safe distance  
from the vehicle in front of you, be-  
cause there are limits to the vehicle  
stability and effectiveness of steering  
wheel operation even with the anti−  
lock brake system on.  
You may hear a click or motor sound in  
the engine compartment for a few seconds  
when the engine is started or just after  
the vehicle begins to move. This means  
that the antilock brake system is in the  
selfcheck mode, and does not indicate a  
malfunction.  
Effective way to press the ABS brake  
pedal: When the antilock brake system  
function is in action, you may feel the  
brake pedal pulsating and hear a noise.  
In this situation, to let the antilock  
brake system work for you, just hold the  
brake pedal down more firmly. Do not  
pump the brake in a panic stop. This  
will result in reduced braking performan-  
ce.  
When the antilock brake system is ac-  
tivated, the following conditions may  
occur. They do not indicate a malfunc-  
tion of the system:  
If tire grip performance exceeds its  
capability, or if hydroplaning occurs  
during high speed driving in the rain,  
the antilock brake system does not  
provide vehicle control.  
D You may hear the antilock brake sys-  
tem operating and feel the brake pedal  
pulsating and the vibrations of the ve-  
hicle body and steering wheel. You  
may also hear the motor sound in the  
engine compartment even after the ve-  
hicle is stopped.  
Antilock brake system is not de-  
signed to shorten the stopping dis-  
tance: Always drive at  
speed and maintain a safe distance  
from the vehicle in front of you.  
Compared with vehicles without an  
antilock brake system, your vehicle  
The antilock brake system becomes op-  
erative after the vehicle has accelerated  
to a speed in excess of approximately 10  
km/h (6 mph). It stops operating when the  
a
moderate  
vehicle decelerates to  
a
speed below  
D At the end of the antilock brake sys-  
tem activation, the brake pedal may  
move a little forward.  
approximately 5 km/h (3 mph).  
may require  
a
longer stopping dis-  
tance in the following cases:  
D Driving on rough, gravel or snow−  
covered roads.  
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07 12.25  
“ABS” warning light  
D Driving with tire chains installed.  
The light comes on when the engine  
switch is turned to the “ON” position. If  
the antilock brake system and the brake  
assist system work properly, the light  
turns off after a few seconds. Thereafter,  
if either of the systems malfunctions, the  
light comes on again.  
D Driving over the steps such as the  
joints on the road.  
D Driving on roads where the road  
surface is pitted or has other differ-  
ences in surface height.  
Install all 4 tires of specified size at  
appropriate pressure: The antilock  
brake system detects vehicle speeds  
using the speed sensors for respec-  
tive wheels’ turning speeds. The use  
of tires other than specified may fail  
to detect the accurate turning speed  
When the “ABS” warning light is on (and  
the brake system warning light is off), the  
following systems do not operate, but the  
brake system still operates conventionally.  
D Antilock brake system  
D Brake assist system  
Type A  
resulting in  
tance.  
a
longer stopping dis-  
D Traction control system  
(twowheel drive models)  
D Active traction control system  
(fourwheel drive models)  
D “AUTO LSD” system  
(twowheel drive models)  
D Vehicle stability control system  
D Downhill assist control system  
(fourwheel drive models)  
D Hillstart assist control system  
Type B  
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07 12.25  
When the “ABS” warning light is on (and  
the brake system warning light is off), the  
antilock brake system does not operate  
so that the wheels will lock up during a  
sudden braking or braking on slippery  
road surfaces.  
Have your Toyota dealer perform the bed-  
dingdown.  
CAUTION  
BRAKE ASSIST SYSTEM  
If the “ABS” warning light remains on  
together with the brake system warn-  
ing light, immediately stop your ve-  
hicle at a safe place and contact your  
Toyota dealer.  
When you slam the brakes on, the  
brake assist system judges as an emer-  
gency stop and provides more powerful  
braking for a driver who cannot hold  
down the brake pedal firmly.  
“VSC OFF” warning light may flashes with  
the “ABS” warning light (brake assist sys-  
tem warning light) when there is a mal-  
function somewhere in the antilock brake  
system (brake assist system).  
In this case, not only the antilock  
brake system will fail but also the  
vehicle will become extremely unsta-  
ble during braking.  
When you slam the brakes on, more pow-  
erful braking will be applied. At this time,  
you may hear  
a
sound in the engine  
If either of the following conditions oc-  
curs, this indicates a malfunction some-  
where in the components monitored by  
the warning light system. Contact your  
Toyota dealer as soon as possible to  
service the vehicle.  
compartment and feel the vibrations of the  
brake pedal. This does not indicate a mal-  
function.  
Either of the following conditions may  
occur, but do not indicate a malfunc-  
tion:  
The brake assist system becomes opera-  
tive after the vehicle has accelerated to  
a speed in excess of approximately 10  
km/h (6 mph). It stops operating when the  
D The light may stay on for about 60  
seconds after the engine switch is  
turned to the “ON” position. It is nor-  
mal if it turns off after a while.  
D The light does not come on when the  
engine switch is turned to the “ON”  
position, or remains on.  
vehicle decelerates to  
a
speed below  
approximately 5 km/h (3 mph).  
D Depressing the brake pedal repeatedly  
may turn on the light. It is normal if it  
turns off after a few seconds.  
D The light comes on while you are dri-  
For an explanation of this system’s warn-  
ing light, see “Service reminder indicators  
and warning buzzers” on page 149 in Sec-  
tion 16.  
ving.  
A warning light turning on briefly during  
operation does not indicate a problem.  
DRUMINDISC TYPE PARKING BRAKE  
SYSTEM  
Your vehicle has  
a
drumindisc type  
parking brake system. This type of brake  
system needs beddingdown of the brake  
shoes periodically or whenever the parking  
brake shoes and/or drums are replaced.  
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