1996 Lexus GS 300 Owners Manual - Page 140

1996 Lexus GS 300 Manual

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STARTING AND DRIVING 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 be longer. Also, the brake system warning light may come on. Anti-lock brake system The anti-lock brake system is designed to prevent lock-up of the wheels during sudden braking or braking on slippery road surfaces. This assists the driver in controlling the vehicle under these circumstances. 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). You may hear a sound in the engine compartment for a few seconds when the engine is started or just after the vehicle is started. This means that the anti-lock brake system is in the self check mode, and does not indicate a malfunction. 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. The brake pedal pulsation caused by the anti-lock brake system may indicate hazardous road surface conditions. Although the anti-lock brake system assists in providing vehicle control, it is still important to drive with all due care, because the anti-lock brake system cannot overcome the laws of physics that act on your vehicle: S Braking capability is dependent on tire friction with the road surface. ! CAUTION Do not drive your vehicle with only a single brake system. Have your 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 reserve vacuum for one or two stops but no more! ! CAUTION S Do not pump the brake pedal if the engine stalls. Each push on the pedal uses up your vacuum reserve. S 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 be longer. 126

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STARTING AND DRIVING
126
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
be longer. Also, the brake system warning light may come
on.
CAUTION
!
Do not drive your vehicle with only a single brake
system. Have your 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 reserve vacuum for one or two stops but no
more
!
CAUTION
!
S
Do not pump the brake pedal if the engine stalls.
Each push on the pedal uses up your vacuum
reserve.
S
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 be longer.
Anti–lock brake system
The anti–lock brake system is designed to prevent
lock–up of the wheels during sudden braking or
braking on slippery road surfaces. This assists the
driver
in
controlling
the
vehicle
under
these
circumstances.
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).
You may hear a sound in the engine compartment for a few
seconds when the engine is started or just after the vehicle
is started. This means that the anti–lock brake system is in
the self check mode, and does not indicate a malfunction.
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.
The brake pedal pulsation caused by the anti–lock brake
system may indicate hazardous road surface conditions.
Although the anti–lock brake system assists in providing
vehicle control, it is still important to drive with all due care,
because the anti–lock brake system cannot overcome the
laws of physics that act on your vehicle:
S
Braking capability is dependent on tire friction with the road
surface.