Porsche 928S 1983 Driver Manual page 69

Power assisted steering
With power-assisted steering, the turning
action on the steering wheel is assisted by a
hydraulic mechanism. At low engine speeds,
e. g. when parking or when driving slowly, the
power-assisted steering is fully effective.
The power assistance reduces with increas-
ing engine revolutions or increasing vehicle
speed and has the effect of producing in-
creasingly positive steering action.
The audible rushing noise that occurs at full
steering lock is a characteristic of the con-
struction and does not indicate a fault in the
steering assembly.
Note that when the engine is not running
(when being towed) or when the hydraulic
steering mechanism is faulty, there is no
power-assist action present. In this case, a
greater effort is required to steer the
vehicle.
Container for hydraulic fluid
The reservoir is mounted on the left hand
inner wheelhouse in the engine compart-
ment.
To check fluid level:
1. Remove cap from reservoir.
2. With the engine running, the fluid level
should be up to the mark in the reservoir. If
necessary top up with hydraulic fluid. To
refill, only use the oils recommended in
the table "Filling quantities".
3. Replace cap on reservoir, ensuring that
the sealing ring sits properly.
1. Release the fixing clips and remove top of
filter housing complete with filter element.
2. Clean out filter housing and renew the fil-
ter element.
3. Carefully replace top of filter housing and
element, and refasten fixing clips.
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