Fiat 1996 Brava Service Manual page 565

Bravo-Brava
Braking system
EBD device
33.
D e s c r i p t i o n of t h e E B D f u n c t i o n ( E l e c t r o n i c B r a k e - f o r c e D i s t r i b u t i o n )
The introduction of the EBD function to the ABS system allows the distribution of the brake force be­
tween the front and rear axles using a specific electronic control unit function.
With this in mind, the electronic control unit constantly compares the speed of the front and rear wheels
by means of speed sensors and controls the hydraulic unit in order to prevent the rear wheels from lock­
ing, always ensuring maximum adhesion to the ground in all load conditions.
The EBD function makes the use of the hydraulic load proportioning valve acting on the rear axle load
superfluous so it has therefore been removged from the braking circuit.
The graph below illustrates the operation of the EBD device (curve D) in relation to the pressure in the
braking system (curve A ) , the ideal braking pressure for the rear axle (curve B) and the reduction in the
braking pressure for the rear axle normally implemented by the conventional load proportioning valve
(curve C).
Forza frenante
asse anteriore
A. Distribution implemented by the braking
system
B. Ideal distribution
C. Distribution implemented by the mechanical
load proportioning valve
D. EBD control
As it can be noted, the EBD function for the A B S system is capaable of adapting to the ideal pressure
curve, always taking advantage of the adhesion available in all braking conditions.
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