Description Of The Operation Of The Anti-Lock Brakes; Rest Position - Fiat 1998 Marea Service Manual

Marea - Marea Weekend

DESCRIPTION OF THE OPERATION OF THE ANTI-LOCK BRAKES

Rest position

Each branch of the ABS EBC 430 system hydraulic circuit is equipped with two two-way solenoid
valves; all the solenoid valves are managed by the control unit (1).
When the pressurizing solenoid valve (9) is deactivated (not connected to earth by the control unit) it is
in an open position, allowing the flow of fluid to the brake caliper.
The pressure maintenance is achieved by closing this valve, i.e. supplying it electrically.
1. Electronic control unit
2. Low pressure accumulator (reservoir)
3. Recovery pump motor
4. Recovery pump
5. Restricter
6. Brake pump
7. Brake servo
When it is deactivated, the discharging solenoid valve (10) (not connected to earth by the control unit)
is in the closed position and does not allow the fluid to be discharged at the low pressure accumulator
(2).
The accumulators (2) have the task of temporarily storing the brake fluid which is available during the
pressure reduction stage.
The recovery pump (4) sends the brake fluid which flows from the brake calipers, during the pressure re-
duction stage, to the brake pump through the restricter (5), which has the task of damping the pressure
and the impulses generated by the pump perceived by the driver.
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Braking system
8. Multi-polar ring
9. Pressurizing solenoid valve
10. Discharging solenoid valve
11. Brake caliper
12. Rpm sensor
13. Single-acting valve
Anti-lock brakes
33.
P4F09BD01
9