Nissan Leaf. Manual - part 308

 

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Nissan Leaf. Manual - part 308

 

 

BRC-22

< SYSTEM DESCRIPTION >

[WITH VDC]

SYSTEM

When ABS Function is Starts Operating (During Pressure Holds)

During pressure front RH brake caliper holds

• Since the ABS IN valve and the ABS OUT valve are closed, the front RH brake caliper, electrically-driven

intelligent brake unit, and reservoir are blocked. This maintains fluid pressure applied on the front RH brake

caliper.

During pressure front LH brake caliper holds

• Since the ABS IN valve and the ABS OUT valve are closed, the front LH brake caliper, electrically-driven

intelligent brake unit, and reservoir are blocked. This maintains fluid pressure applied on the front LH brake

caliper.

During pressure rear RH brake caliper holds

• Since the ABS IN valve and the ABS OUT valve are closed, the rear RH brake caliper, electrically-driven

intelligent brake unit, and reservoir are blocked. This maintains fluid pressure applied on the rear RH brake

caliper.

During pressure rear LH brake caliper holds

• Since the ABS IN valve and the ABS OUT valve are closed, the rear LH brake caliper, electrically-driven

intelligent brake unit, and reservoir are blocked. This maintains fluid pressure applied on the rear LH brake

caliper.

JSFIA1839GB

Name

Not activated

During pressure holds

Cut valve 1

Power supply is not supplied (open)

Power supply is not supplied (open)

Cut valve 2

Power supply is not supplied (open)

Power supply is not supplied (open)

Suction valve 1

Power supply is not supplied (close)

Power supply is not supplied (close)

Suction valve 2

Power supply is not supplied (close)

Power supply is not supplied (close)

ABS IN valve

Power supply is not supplied (open)

Power supply is supplied (close)

ABS OUT valve

Power supply is not supplied (close)

Power supply is not supplied (close)

Each brake caliper (fluid pressure)

Pressure holds

SYSTEM

BRC-23

< SYSTEM DESCRIPTION >

[WITH VDC]

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When ABS Function is in Operation (During Pressure Decreases)

During pressure front RH brake caliper decreases

• Since the ABS IN valve is closed and the ABS OUT valve is opened, fluid pressure applied on the front RH

brake caliper is supplied to the reservoir through the ABS OUT valve. This fluid pressure decreases when

sent to the electrically-driven intelligent brake unit by the pump.

During pressure front LH brake caliper decreases

• Since the ABS IN valve is closed and the ABS OUT valve is opened, fluid pressure applied on the front LH

brake caliper is supplied to the reservoir through the ABS OUT valve. This fluid pressure decreases when

sent to the electrically-driven intelligent brake unit by the pump.

During pressure rear RH brake caliper decreases

• Since the ABS IN valve is closed and the ABS OUT valve is opened, fluid pressure applied on the rear RH

brake caliper is supplied to the reservoir through the ABS OUT valve. This fluid pressure decreases when

sent to the electrically-driven intelligent brake unit by the pump.

During pressure rear LH brake caliper decreases

• Since the ABS IN valve is closed and the ABS OUT valve is opened, fluid pressure applied on the rear LH

brake caliper is supplied to the reservoir through the ABS OUT valve. This fluid pressure decreases when

sent to the electrically-driven intelligent brake unit by the pump.

JSFIA1840GB

Name

Not activated

During pressure decreases

Cut valve 1

Power supply is not supplied (open)

Power supply is not supplied (open)

Cut valve 2

Power supply is not supplied (open)

Power supply is not supplied (open)

Suction valve 1

Power supply is not supplied (close)

Power supply is not supplied (close)

Suction valve 2

Power supply is not supplied (close)

Power supply is not supplied (close)

ABS IN valve

Power supply is not supplied (open)

Power supply is supplied (close)

ABS OUT valve

Power supply is not supplied (close)

Power supply is supplied (open)

Each brake caliper (fluid pressure)

Pressure decreases

BRC-24

< SYSTEM DESCRIPTION >

[WITH VDC]

SYSTEM

When Brake Release

During front RH brake caliper release

• Brake fluid is supplied to the front RH brake caliper through the return check valve of the ABS IN valve and

the cut valve 2, and returns to the electrically-driven intelligent brake unit.

During front LH brake caliper release

• Brake fluid is supplied to the front LH brake caliper through the return check valve of the ABS IN valve and

the cut valve 1, and returns to the electrically-driven intelligent brake unit.

During rear RH brake caliper release

• Brake fluid is supplied to the rear RH brake caliper through the return check valve of the ABS IN valve and

the cut valve 1, and returns to the electrically-driven intelligent brake unit.

During rear LH brake caliper release

• Brake fluid is supplied to the rear LH brake caliper through the return check valve of the ABS IN valve and

the cut valve 2, and returns to the electrically-driven intelligent brake unit.

Component Parts and Function

JSFIA1841GB

Name

Not activated

During brake release

Cut valve 1

Power supply is not supplied (open)

Power supply is not supplied (open)

Cut valve 2

Power supply is not supplied (open)

Power supply is not supplied (open)

Suction valve 1

Power supply is not supplied (close)

Power supply is not supplied (close)

Suction valve 2

Power supply is not supplied (close)

Power supply is not supplied (close)

ABS IN valve

Power supply is not supplied (open)

Power supply is not supplied (open)

ABS OUT valve

Power supply is not supplied (close)

Power supply is not supplied (close)

Each brake caliper (fluid pressure)

Pressure decreases

Component

Function

Pump

Returns the brake fluid reserved in reservoir to electrically-driven intelligent brake unit by reducing 
pressure.

Motor

Activates the pump according to signals from control unit part.

SYSTEM

BRC-25

< SYSTEM DESCRIPTION >

[WITH VDC]

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CONDITION FOR TURN ON THE WARNING LAMP

Turns ON when power switch turns ON and turns OFF when the system is normal, for bulb check purposes.

CONDITION FOR TURN ON THE INDICATOR LAMP

• Turns ON when VDC function and TCS function are switched to non-operational status (OFF) by VDC OFF

switch.

• Turns ON when power switch turns ON and turns OFF when the system is normal, for bulb check purposes.

Cut valve 1
Cut valve 2

Shuts off the ordinary brake line from electrically-driven intelligent brake unit.

Suction valve 1
Suction valve 2

Supplies the brake fluid from electrically-driven intelligent brake unit to the pump.

ABS IN valve

Switches the fluid pressure line to increase or hold according to signals from control unit part.

ABS OUT valve

Switches the fluid pressure line to hold or decrease according to signals from control unit part.

Inlet valve

Brake fluid sucked from the reservoir by the pump does not backflow.

Outlet valve

Brake fluid discharged from the pump does not backflow.

Return check valve

Returns the brake fluid from brake caliper to electrically-driven intelligent brake unit by bypassing 
orifice of each valve when brake is released.

Reservoir

Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently de-
creases when decreasing pressure of brake caliper.

Master cylinder pressure sensor

Detects the brake fluid pressure from master cylinder part and transmits signal to ABS actuator and 
electric unit (control unit).

Component

Function

Condition (status)

ABS warning lamp

Brake warning lamp 

VDC  warning  lamp

Power switch OFF

OFF

OFF

OFF

For several seconds after the power switch is turned ON

ON

ON

ON

Several seconds after power switch is turned ON (when the system 
is in normal operation)

OFF

OFF

OFF

Set the vehicle READY

OFF

OFF

OFF

When brake fluid is less than the specified level (brake fluid level 
switch ON)

OFF

ON

OFF

When parking brake operates (parking brake switch ON)

OFF

ON

OFF

VDC function is malfunctioning

OFF

OFF

ON

TCS function is malfunctioning

OFF

OFF

ON

ABS function is malfunctioning

ON

OFF

ON

EBD function is malfunctioning

ON

ON

ON

Brake limited slip differential (BLSD) function is malfunctioning

OFF

OFF

ON

Brake assist function is malfunctioning

OFF

OFF

ON

Electrically-driven intelligent brake unit function is malfunctioning

ON

ON

ON

VDC function is operating

OFF

OFF

Blinking

TCS function is operating

OFF

OFF

Blinking

ABS function is operating

OFF

OFF

OFF

EBD function is operating

OFF

OFF

OFF

Brake limited slip differential (BLSD) function is operating

OFF

OFF

Blinking

Brake assist function is operating

OFF

OFF

OFF

Condition (status)

VDC OFF indicator lamp

Power switch OFF

OFF

For several seconds after the power switch is turned ON

ON

 

 

 

 

 

 

 

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