Brake System; Brake Booster; Anti-Lock Brake System (With Abs Warning Light) - Toyota 2006 Sienna Owner's Manual

Brake system

The tandem master cylinder brake system
is a hydraulic system with two separate
sub- systems. If either sub- system should
fail, the other will still work. However, the
pedal will be harder to press, and your
stopping distance will increase. Also, the
brake system warning light may come on.
CAUTION
Do not drive your vehicle with only a
single brake system. Have
brakes fixed immediately.

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!
382
06 SIENNA_U (L/O 0603)
CAUTION
Do not pump the brake pedal if the
D
engine stalls. Each push on the
pedal uses up your reserved vacu-
um.
Even if the power assist is com-
D
pletely lost, the brakes will still
work. But you will have to push the
pedal hard, much harder than nor-
your mal. And your braking distance will
increase.
ANTI- LOCK BRAKE
"ABS" warning light)
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 steer-
ing 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 performan-
ce.
The anti- lock brake system becomes op-
erative after the vehicle has accelerated
to a speed in excess of approximately 10
km/h (6 mph). It stops operating when the
SYSTEM (with
vehicle decelerates
approximately 5 km/h (3 mph).
Depressing the brake pedal on slippery
road surfaces such as on a manhole cov-
er, a steel plate at a construction site,
joints in a bridge, etc. on a rainy day
tends to activate the anti- lock brake sys-
tem.
You may hear a click or motor sound in
the engine compartment for a few seconds
when the engine is started or 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.
2006 SIENNA from March '06 Prod. (OM45443U)
to a speed below