Brake Assist System - Toyota Prius 2007 Owner's Manual

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"ABS" warning light
The light comes on when the "IG−ON"
mode is enabled. If the anti−lock brake
system works properly, the light turns
off after the "READY" light comes on.
Thereafter, if the system malfunctions,
the light comes on again.
When the "ABS" warning light is on (and
the brake system warning light is on), the
anti−lock brake system does not operate,
but the brake system still operates con-
ventionally.
If any of the following conditions oc-
curs, this indicates a malfunction some-
where in the components monitored by
the warning light system. Contact your
Toyota dealer as soon as possible to
service the vehicle.
"
The light does not come on when the
"IG−ON" mode is enabled, or
"READY" light remains on.
"
The light comes on while you are driv-
ing.
A warning light turning on briefly during
operation does not indicate a problem.
330
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CAUTION
If the "ABS" warning light remains on
together with the red brake system
warning light, immediately stop your
vehicle at a safe place and contact
your Toyota dealer.
In this case, not only the anti−lock
brake system function and brake as-
sist function will fail but also the ve-
hicle will become extremely unstable
during braking.
Any of the following conditions may oc-
cur, but does not indicate a malfunc-
tion:
"
The light may stay on for about 60
seconds after the "IG−ON" mode is en-
abled. It is normal if it turns off after
the
a while.
"
Depressing the brake pedal repeatedly
may turn on the light. It is normal if
it turns off after a few seconds.

BRAKE ASSIST SYSTEM

When you slam the brakes on, the
brake assist system judges as an emer-
gency stop and provides more powerful
braking for a driver who cannot hold
down the brake pedal firmly.
When you slam the brakes on, more pow-
erful braking will be applied. At this time,
you may hear a sound in the engine
compartment. This does not indicate a
malfunction.
The brake assist system becomes opera-
tive 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).
For an explanation of this system's warn-
ing light, see "Service reminder indicators
and warning buzzers" on page 125.