Nissan Leaf. Instruction — 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]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
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]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
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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