Lexus RX300 Manual page 198

Anti–lock brake system
The anti–lock brake system is designed to automatically help
prevent lock–up of the wheels during a sudden brake or braking
on slippery road surfaces. This assists in providing directional
stability and steering performance of the vehicle under these
circumstances.
The anti–lock brake system becomes operative after the vehicle has
accelerated to a speed in excess of approximately 10 km/h (6 mph).
It stops operating when the vehicle decelerates to a speed below
approximately 5 km/h (3 mph).
You may hear a sound in the engine compartment for a few seconds
when the engine is started or just after the vehicle is started. This
means that the anti–lock brake system is in the self–check mode, and
does not indicate a malfunction.
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. This will result in reduced braking
performance.
The brake pedal pulsation caused by the anti–lock brake system may
indicate hazardous road surface conditions. Although the anti–lock
brake system assists in providing vehicle control, it is still important
to drive with all due care, because the anti–lock brake system cannot
overcome the laws of physics that act on your vehicle:
D Braking capability is dependent on tire friction with the road
surface.
STARTING AND DRIVING
D Even though the anti–lock brake system is operating, a driver
cannot maintain full control on certain slippery road surfaces,
when cornering at high speeds, or in violent maneuvers.
D Avoid high speeds on wet roads. The anti–lock brake system
cannot eliminate the risk of hydroplaning and loss of tire friction.
Always maintain a safe distance from the vehicle in front of you.
Compared with vehicles not fitted with an anti–lock brake system,
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 on roads where the road surface is pitted or has other
differences in surface height.
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