Ferrari F430 - Brake, ABS, EBD, and Steering Systems

120
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: ensures 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: ensures stability and maximum
traction only in medium- to
high-grip conditions (SPORT
position), optimising engine and
brake control.
Level 3: enhances the racing features of
the vehicle, ensuring (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, that
are always enabled in the other
positions, remain active, (see
page 121).
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.
Brake 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 tted with solenoid valves
and scavenge pump, which intervenes, 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 efcient.
The vacuum brake servo supplies the
hydraulic ECU with brake uid at the
pressure required for system operation.
In the case of ABS activation, the solenoid
valves in the hydraulic ECU will intervene
with suitable adjusting cycles, in order to
prevent the wheels from locking.
Brake uid tank
Positioned in the front compartment, it is
shared with the clutch system in vehicles
with mechanical gearbox.
Idle stroke of the brake pedal
The max. idle stroke of the brake pedal
should be 8-10 mm (0.315–0.393 in.).
If it becomes excessive, or if one wheel
brakes more than the others, or if the
control pedal feels springy with reduced
braking efciency, a complete inspection