Lexus RX400h2006 Owner's Manual page 477

STARTING AND DRIVING
When the anti−lock brake system function is activated, the
following conditions may occur. They do not indicate a
malfunction of the function:
D You may hear the anti−lock brake system function operating
and feel the brake pedal pulsating and the vibrations of the
vehicle body and steering wheel. You may also hear the
motor sound in the engine compartment even after the
vehicle is stopped.
D At the end of the activation, the brake pedal may move a little
forward.
CAUTION
The anti−lock brake system 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
anti−lock brake device. If tire chains are used, braking
distance may become longer.
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Compared with vehicles without an anti−lock brake
device, your vehicle may require a longer stopping
distance in the following cases:
D Driving on rough, gravel or snow−covered roads.
D Driving with tire chains installed.
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 differences in surface height.
If tire grip performance exceeds its capability, or if
hydroplaning occurs during high speed driving in the
rain, the anti−lock brake system does not provide
vehicle control.