Brake Fluid Reservoir - Porsche 928 ST1991 Owner's Manual

Brake fluid reservoir (B)
The brake fluid reservoir is located in the en-
gine compartment.
The brake fluid reservoir has three cham-
bers: one for each of the dual brake circuits,
and one for the clutch.
Check the brake fluid level regularly. Since
the reservoir is transparent, the fluid level
can be checked without removing the filler
cap. The fluid level should always be bet-
ween the MIN and MAX marks.
To add brake fluid, unscrew the cap. The
vent bore in the cap should be kept clean.
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Should the fluid level drop below the MIN
mark, the brake fluid warning light comes
on and a fault message appears in the in-
formation system display. Pull off the
road, stop the engine and add brake fluid
immediately or contact
Porsche dealer to have the cause located
and corrected.
WARNING
• Every 2 years the brake fluid has to be
replaced. See your Warranty & Mainte-
nance booklet.
• If brake fluid must be added to the reser-
voir, use only new and unused DOT 3 or
DOT 4 brake fluid that meets SAE
specification J 1703 and conforms to
Motor Vehicle Safety Standard 116.
• Do not use any other brake fluid or brake
fluids that have absorbed moisture from
the open air, or brake fluid that is dirty.
It may cause premature wear or unreli-
able braking action.
• Do not add or mix DOT 5 silicone type
brake fluid with the brake fluid in your
vehicle as severe component corrosion
may result. Such corrosion could lead
to brake system failure.
• The brake warning light does not indi-
cate brake fluid level. Check fluid level
between regular maintenance services.
• Brake fluid is poisonous. Brake fluid is
also harmful to the paint of your vehicle.
the nearest
Checking refrigerant level
Check the refrigerant level in the reservoir at
least once a year because the fluid di-
minishes gradually during operation.
Turn on the air conditioner and observe refri-
gerant level through sight glass (arrow) in the
reservoir.
Occasional bubbles are normal.
Foam or a constant stream of bubbles indi-
cate that the system does not contain
enough refrigerant.
In case the system requires recharging, con-
tact your Porsche dealer. He has qualified
personnel and the necessary equipment.