Volvo 164 1971, Инструкция

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TECHNICAL DESCRIPTION
BRAKES
The brake system is of the two-circuit type
with disc brakes all round. The system is
provided with a tandem-type master cylin-
der and a directly-operating booster cylin-
der. When the brake pedal is depressed,
the master cylinder is operated mechani-
cally via the booster cylinder, this boost-
i ng the pedal force about four times. The
brake pressure is transmitted hydraulically
from the master cylinder through the brake
li nes to the wheel cylinders. The pistons in
these are then pressed outwards and oper-
ate the brake pads. The pressure lines to
32
the rear wheel brakes are provided with
reducer valves which prevent locking of the
car wheels.
The principle of the two-circuit system is
that both the front wheels are connected
to one rear wheel, that is, should there be
a failure in one of the circuits, there is al-
ways braking power on both front wheels
and the other rear wheel. At normal pedal
pressure the braking effect of each of the
circuits is 50 % , but when pedal pressure
is increased, about 80% of the full braking
power can be obtained in the one circuit.
This provides maximum safety and pre-
vents lateral dragging and rear-end lurch-
i ng. With the engine stopped, the booster
assists the braking a further 2 or 3 times
after which the pedal pressure must be
i ncreased about four times in order to
obtain a braking power corresponding to
the braking power available with the en-
gine running.
The parking brake operates the rear wheels
mechanically as the brake discs have also
been designed as brake drums in order to
i ncorporate the shoes for the handbrake.