Lexus GS 350 Owner's Manual page 356

Operating conditions of emergency brake signal
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When the following three conditions are met, the emergency brake signal will operate:
The emergency flashers are off.
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Actual vehicle speed is over 55 km/h (35 mph).
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The brake pedal is depressed in a manner that cause the system to judge from the vehi-
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cle deceleration that this is a sudden braking operation.
Automatic system cancelation of emergency brake signal
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The emergency brake signal will turn off in any of the following situations:
The emergency flashers are turned on.
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The brake pedal is released.
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The system judges from the vehicle deceleration that is not a sudden braking operation.
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WARNING
The ABS does not operate effectively when
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The limits of tire gripping performance have been exceeded (such as excessively
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worn tires on a snow covered road).
The vehicle hydroplanes while driving at high speed on wet or slick roads.
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Stopping distance when the ABS is operating may exceed that of normal conditions
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The ABS is not designed to shorten the vehicle's stopping distance. Always maintain a
safe distance from the vehicle in front of you, especially in the following situations:
When driving on dirt, gravel or snow-covered roads
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When driving with tire chains
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When driving over bumps in the road
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When driving over roads with potholes or uneven surfaces
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GS350_300_GS F_OM_OM30J17E_(GE)
4-5. Using the driving support systems
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