Lexus RX300 Manual page 199

STARTING AND DRIVING
"ABS" warning light
31R017a
This light comes on when the ignition key is turned to the "ON"
position. After about a few seconds, the light will go off.
If either of the following conditions occurs, this indicates a
malfunction somewhere in the parts monitored by the warning light
system. Contact your Lexus dealer as soon as possible to service the
vehicle.
D The light does not come on as described above, or remains on.
D The light comes on while driving.
Even if the anti–lock brake system should fail, the brake system will
still operate conventionally. But when the "ABS" warning light is
on (and the brake system warning light is off), anti–lock brake
system is not assisting brake performance so that the wheels could
lock up during a sudden brake or braking on slippery road surfaces.
Have your vehicle checked by your Lexus dealer as soon as possible.
184
Drum–in–disc type parking brake system
Your vehicle has a drum–in–disc type parking brake system. This
type of brake system needs bedding–down of the brake shoes
periodically or whenever the parking brake shoes and/or drums are
replaced.
Have your Lexus dealer perform the bedding–down.