Jeep Grand Cherokee User Manual page 79

Be sure the parking brake is fully disengaged
before driving. Failure to do so can lead to brake
failure.
NOTE:
Parking brake adjustment and maintenance
should be performed by your authorized
dealer.
ANTI-LOCK BRAKE SYSTEM
The 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 help avoid
skidding on slippery surfaces.
All vehicle wheels and tires must be the same size
and type and tires must be properly inflated to
produce accurate signals for the computer.
WARNING!
Significant over or under inflation of tires, or
mixing sizes of tires or wheels on the vehicle
can lead to loss of braking effectiveness.
The Anti-Lock Brake System conducts a low-
speed self-test at about 20 km/h (12 mph). If you
have your foot lightly on the brake while this test is
occurring you may feel slight pedal movement.
The movement can be more apparent on ice and
snow. This is normal.
The Anti-Lock Brake System pump motor runs
during the self-test at 20 km/h (12 mph) and
during an ABS stop. The pump motor makes a low
humming noise during operation, which is normal.
WARNING!
Pumping of the Anti-Lock Brakes will diminish
their effectiveness and may lead to an accident.
Pumping makes the stopping distance longer.
Just press firmly on your brake pedal when you
need to slow down or stop.
CAUTION!
The Anti-Lock Brake System is subject to pos-
sible detrimental effects of electronic interfer-
ence caused by improperly installed after-
market radios or telephones.
NOTE:
During severe braking conditions, a pulsing
sensation may occur and a clicking noise will
be heard. This is normal, indicating that the
Anti-Lock Brake System is functioning.
WARNING!
To use your brakes and accelerator more safely,
follow these tips:
• Do not "ride" the brakes by resting your foot on
the pedal. This could overheat the brakes and
result in unpredictable braking action, longer
stopping distances, or brake damage.
• When descending mountains or hills, repeated
braking can cause brake fade with loss of
braking control. Avoid repeated heavy braking
by downshifting the transmission or locking out
overdrive whenever possible.
• Engines may idle at higher speeds during
warm-up, which could cause rear wheels to
spin and result in loss of vehicle control. Be
especially careful while driving on slippery
roads, in close-quarter maneuvering, parking
or stopping. The Quadra-Trac II transfer case
engages four-wheel drive automatically when
required.
• Do not drive too fast for road conditions, espe-
cially when roads are wet or slushy. A wedge of
water can build up between the tire tread and
the road. This hydroplaning action can cause
loss of traction, braking ability, and control.
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