Brake Booster; Anti−Lock Brake System - Lexus RX330 2005 Owner's Manual

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STARTING AND DRIVING

Brake booster

The brake booster uses engine vacuum to power−assist the
brakes. If the engine should quit while you are driving, you can
bring the vehicle to a stop with normal pedal pressure. There
is enough reserved vacuum for one or two stops but no more!
CAUTION
D Do not pump the brake pedal if the engine stalls.
Each push on the pedal uses up your reserved
vacuum.
D Even if the power assist is completely lost, the brakes
will still work. But you will have to push the pedal
hard, much harder than normal. And your braking
distance will increase.
458
Anti−lock brake system
The anti−lock brake system is designed to help prevent
lock−up of the wheels during a sudden braking or braking
on slippery road surfaces.
This assists in providing
directional stability and steering performance of the
vehicle under these circumstances.
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 in a
panic stop. This will result in reduced braking performance.
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).
Depressing the brake pedal on slippery road surfaces such as
on a manhole cover, a steel plate at a construction site, joints
in a bridge, etc. on a rainy day tends to activate the anti−lock
brake system.
You may hear a click or motor sound in the engine
compartment for a few seconds just after the vehicle begins to
move. This means that the anti−lock brake system is in the
self−check mode, and does not indicate a malfunction.

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