Lexus RX400h2006, Owner'S Manual

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STARTING AND DRIVING
449
Brake assist function
The brake assist function is designed to assist with emergency
braking. When the driver suddenly depresses the brake pedal,
the device treats it as emergency braking and adds braking
force.
If you slam the brakes on or apply the brakes more firmly, more
powerful braking will be applied. At this time, you may hear a
sound in the engine compartment and feel the vibrations of the
brake pedal. This does not indicate a malfunction.
CAUTION
The brake assist function is not designed to shorten
braking distance. Always drive at a moderate speed and
maintain a safe distance from the vehicle in front of you.
Depending on road conditions, braking distance may be
longer than that of a vehicle without the brake assist
device. If tire chains are used, braking distance may
become longer.
Anti−lock brake system function
The anti
−
lock brake system function is designed to help
prevent lock
−
up of the wheels during sudden braking or when
braking on slippery road conditions. This assists in providing
directional stability and steering performance of the vehicle
under these circumstances.
Effective way to press the ABS brake pedal: When the
anti
−
lock brake system function is in action, you may feel the
brake pedal pulsating and hear a noise. In this situation, to
let the anti
−
lock 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 performance.
Depressing the brake pedal on slippery road surfaces such as
on a manhole cover, a steel plate at a construction site, joints
in a bridge, etc. on a rainy day tends to activate the anti
−
lock
brake system function.
You may hear a click or motor sound in the engine
compartment for a few seconds just after the vehicle begins to
move. This means that the anti
−
lock brake system function is
in the self
−
check mode, and does not indicate a malfunction.