140
CST system
CST
is
Ferrari’
s acronym
for Traction and
Stability control. The CST is composed of
two main systems:
VDC
Vehicle Dynamics Control,
through the braking system;
ASR
Vehicle Dynamics Control,
through the engine torque;
as well as the always active secondary
systems such as ABS, EBD, etc.
In order to have optimal control in different
driving and grip conditions, four different
setting levels have been designed.
Level 1
: helps ensure stability and
maximum traction on any type of
roadway, both in low-grip (“Low
Grip” position) and in very low
grip (ICE position) conditions,
by means of the engine and
brake control.
Level 2
: helps ensure stability and
maximum traction only in
medium- to high-grip conditions
(SPORT position), optimizing
engine and brake control.
Level 3
: enhances the racing features of
the vehicle, helping ensure (but
not in all conditions) a good
level of stability (RACE position)
by reducing engine control to a
minimum and making best use of
the brake control.
Level 4
: CST deactivated (
position).
Stability is not ensured, however,
all the other auxiliary systems,
such as the ABS and EBD, which
are always enabled in the other
positions, remain active, (see
page 141
).
The driver will easily perceive enhanced
driving comfort (engine load limiting and
torque feedback), driving will be extremely
smooth, without jerks which could be
annoying and prevent the driver from fully
appreciating the potential of the vehicle.
Moreover, the several settings available
(depending on the level of grip) allow
driving at higher speeds, stability and easy
control, in any condition.
Braking system
The hydraulically-controlled braking
system is composed of ventilated disc
brakes on the four wheels, a “tandem”
vacuum brake servo and a hydraulic
control unit fitted with solenoid valves
and scavenge pump, which activates, if
the wheels lock, by adjusting the caliper
pressure (ABS).
The hydraulic circuits have crossed
branching and are independent for the
front and rear brakes. If one of the circuits
is faulty, emergency braking is always
possible if the circuit is efficient.
The vacuum brake servo supplies the
hydraulic ECU with brake fluid at the
pressure required for system operation.
In the case of ABS activation, the solenoid
valves in the hydraulic ECU will activate
with suitable adjusting cycles, in order to
prevent the wheels from locking.
Brake fluid tank
Positioned in the front compartment, it is
shared with the clutch system in vehicles
with mechanical gearbox.
Free play of the brake pedal
The maximum free play of the brake pedal
should be 0.31-0.39 in. (8-10 mm).
If it becomes excessive, or if one wheel
brakes more than the others, or if the
pedal feels spongy with reduced braking
efficiency, a complete inspection of
Содержание 2006 F430 Spider
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