Toyota LEXUS LS430 2005 Manual page 103

GAUGES, METERS AND SERVICE REMINDER INDICATORS
(a) Brake System Warning Light
This light comes on in the following cases when the ignition
switch is in the "ON" position.
D When the parking brake is applied ...
This light comes on for a few seconds when the ignition switch
is turned to the "ON" position even after the parking brake is
released.
D When the brake fluid level is low ...
CAUTION
It is dangerous to continue driving normally when the
brake fluid level is low.
Have your vehicle checked at your Lexus dealer in the
following case:
D The light does not come on even if the parking brake is
applied when the ignition switch is in the "ON" position.
D The light does not come on even if the ignition switch is
turned on with the parking brake released.
A warning light turning on briefly during operation does not
indicate a problem.
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CAUTION
If either of the following conditions occurs, immediately
stop your vehicle at a safe place and contact your Lexus
dealer.
D The light does not turn off even after the parking
brake is released while the engine is running.
In this case, the brakes may not work properly and
your stopping distance will become longer. Depress
the brake pedal firmly and bring the vehicle to an
immediate stop.
D The brake system warning light remains on together
with the "ABS" warning light.
In this case, not only the anti−lock brake system will
fail but also the vehicle will become extremely
unstable during braking.