Function; Solenoid Valves In The Hydraulic Control Unit; Inlet And Outlet Solenoid Valve Pairs For One Wheel Brake - Ford Transit 2002 Owner's Manual

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Function

Solenoid valves in the hydraulic control unit

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The hydraulic control unit comprises the valve block with the electric motor (pump).
Each having one inlet and outlet valve, the brake pressure is modulated for each individual
wheel brake.
These is also one separation valve and one changeover valve for each brake circuit, in order
to allow braking intervention for the driven wheels during traction control (brake pressure is
created without the driver operating the brakes).
The relay (semiconductor relay) for system changeover and for the pump motor, and also
the relay (semiconductor relay) for the solenoid valves are integrated in the electronic
control unit as electronic components.
The pump motor and the electronic controller with the relays as drivers are bolted directly
to the hydraulic control unit.

Inlet and outlet solenoid valve pairs for one wheel brake

On vehicles with ABS if the electronic control unit detects a rapid decrease in the speed of
revolution of a wheel, which is characteristic when a wheel locks (the wheel deceleration is
greater than the maximum possible wheel deceleration), it outputs the corresponding
signals for brake pressure modulation to the valves.
Ignition lock
Stoplamp switch
Valve block
Pump motor
Warning lamp ABS
Warning lamp TCS
Braking system warning lamp (warning lamp for electronic brake
distribution)
Description
Separation valves and changeover valves
Outlet solenoid valves
Inlet solenoid valves
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