Brake - Booster - Porsche 928 1980 Owner's Manual

Parking brake lever (arrow)
Parking brake force is mechanically trans-
ferred to the rear wheels by means of cables.
To set the parking brake...
- press in the release button (arrow) at the
end of the lever as you pull the lever up.
The parking brake engages as soon as
you release the button in the raised lever.
36
To release the parking brake...
- pull the lever slightly up as you depress
the release button. Keep the button de-
pressed as you lower the lever.
The central warning light and the parking
brake light will go out after the engine is
started and the parking brake is fully re-
leased (see "Central warning lightsystem").
Loudspeaker balance control
The volume of the loudspeakers in the door
and in the rear of the vehicle can be balan-
ced by turning the loudspeaker balance con-
trol knob (A), located next to the parking
brake lever.
Brake pedal
Your Porsche is equipped with a hydraulic
dual circuit brake system with selfadjusting
disc brakes at the front and rear. Make it a
habit to check the operation of your brakes
before driving o f f . T h e movement of the
brake pedal should not be obstructed by a
floor mat or other objects.
With correctly adjusted brakes, and a cor-
rectly working brake system, the pedal travel
to the point of brake actuation should be
1-3/16" to 1-9/16" or 30 to 40 mm. When-
ever the brake pedal travel exceeds this dis-
tance, have the brake system checked.
Keep in mind that the braking distance in-
creases very rapidly as the speed increases.
At 60 mph or 96 km/h, for example, it is not
twice but four times longer than at 30 mph
or 48 km/h. Tire traction is also less effec-
tive when the roads are wet or slippery.
Therefor, always maintain a safe distance.
Driving through deep water may reduce tire
traction. Moisture on the brakes may also
affect braking efficiency. Cautiously apply
the brakes for a test. If you notice a lag in
the braking action, the brakes may be wet.
They will dry after you have applied the
brakes a few times, but do it very cautiously.
Brake booster
The brake booster assists braking only when
the engine is running. When the car is
moving while the engine is not running, or if
the brake booster is defective, more pres-
sure on the brake pedal is required to bring
the car to a halt.
Brake warning lights
The central warning light and the brake fluid
warning light in the combination instrument
will flash when the level in the brake fluid
reservoir is too low. To report a brake cir-
cuit failure, the central warning light and
the brake pressure warning light will flash
(see "Central warning light system").