ACTi E46 Manual do Utilizador descarregar pdf (Página 41)

Pressure Build already occurs during normal braking, so when ABS first intervenes it will

start holding pressure by energizing the Inlet Valve. For example, if the right rear wheel is

locking up, both Inlet Valves will be energized, regulating both wheels together. This logic

is known as Select Low. Front wheels can be regulated individually as needed to prevent

lockup.

Energizing the Inlet Valve closes the brake fluid passage to the calipers and traps the fluid

at the current pressure, thus not allowing the brake pressure to rise any further.

If the wheel speed does not increase the Pressure Release phase begins.

Pressure Release occurs when the control unit energizes the Outlet Valve while continuing

to hold the Inlet Valve closed. The trapped brake fluid is released out of the calipers,

reducing braking pressure.

At the same time, the pump is switched on which draws in the released brake fluid and

pumps it back into the pressure-build circuit restoring the volume of brake fluid again in

front of the Inlet valve.

Depending on conditions the ABS system may cycle between these three phases from 3

to 12 times a second to prevent wheel lock.

Teves DSC III MK 60

FRONT AXLE BRAKE CIRCUITS

CUITS

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ACTi E46 Manual do Utilizador Página 41