Nissan X-Trail 32. Manual - part 143

BRC-38

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

SYSTEM

The amount of brake fluid supplied to the rear LH brake from the master cylinder is controlled according to
time that the ABS IN valve is not energized (time that the ABS IN valve is open).

When ABS Function is Operating (During Pressure Holds)

During pressure front RH brake holds

• Since the ABS IN valve and the ABS OUT valve are closed, the front RH brake, master cylinder, and reser-

voir are blocked. This maintains fluid pressure applied on the front RH brake.

During pressure front LH brake holds

• Since the ABS IN valve and the ABS OUT valve are closed, the front LH brake, master cylinder, and reser-

voir are blocked. This maintains fluid pressure applied on the front LH brake.

During pressure rear RH brake holds

• Since the ABS IN valve and the ABS OUT valve are closed, the rear RH brake, master cylinder, and reser-

voir are blocked. This maintains fluid pressure applied on the rear RH brake.

During pressure rear LH brake holds

• Since the ABS IN valve and the ABS OUT valve are closed, the rear LH brake, master cylinder, and reser-

voir are blocked. This maintains fluid pressure applied on the rear LH brake.

JSFIA1739GB

Component parts

Not activated

When pressure holds

Cut valve 1

Power supply is not supplied (open)

Cut valve 2

Power supply is not supplied (open)

Suction valve 1

Power supply is not supplied (close)

Suction valve 2

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)

Each brake (fluid pressure)

—

Pressure holds

SYSTEM

BRC-39

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

BRC

When ABS Function is in Operation (During Pressure Decreases)

During pressure front RH brake decreased

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

brake is supplied to the reservoir through the ABS OUT valve. This fluid pressure decreases when sent to
the master cylinder by the pump.

During pressure front LH brake decreased

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

brake is supplied to the reservoir through the ABS OUT valve. This fluid pressure decreases when sent to
the master cylinder by the pump.

During pressure rear RH brake decreased

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

brake is supplied to the reservoir through the ABS OUT valve. This fluid pressure decreases when sent to
the master cylinder by the pump.

During pressure rear LH brake decreased

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

brake is supplied to the reservoir through the ABS OUT valve. This fluid pressure decreases when sent to
the master cylinder by the pump.

JSFIA1740GB

Component parts

Not activated

When pressure decreases

Cut valve 1

Power supply is not supplied (open)

Cut valve 2

Power supply is not supplied (open)

Suction valve 1

Power supply is not supplied (close)

Suction valve 2

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 (fluid pressure)

—

Pressure decreases

BRC-40

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

SYSTEM

When Brake Release

During pressure front RH brake release

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

valve 1, and returns to the master cylinder.

During pressure front LH brake release

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

valve 2, and returns to the master cylinder.

During pressure rear RH brake release

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

valve 2, and returns to the master cylinder.

During pressure rear LH brake release

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

valve 1, and returns to the master cylinder.

Component Parts and Function

JSFIA1741GB

Component pars

Not activated

When pressure decrease

Cut valve 1

Power supply is not supplied (open)

Cut valve 2

Power supply is not supplied (open)

Suction valve 1

Power supply is not supplied (close)

Suction valve 2

Power supply is not supplied (close)

ABS IN valve

Power supply is not supplied (open)

ABS OUT valve

Power supply is not supplied (close)

Each brake (fluid pressure)

—

Pressure decreases

Component parts

Function

Pump

• Pressure the brake fluid and send.
• Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.

Motor

Activates the pump according to signals from ABS actuator and electric unit (control unit).

SYSTEM

BRC-41

< SYSTEM DESCRIPTION >

[WITH VDC (ESP)]

BRC

CONDITION FOR TURN ON THE WARNING LAMP

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

*: 4WD models with gasoline engine

CONDITION FOR TURN ON THE INDICATOR LAMP

Turns ON when ignition 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 master cylinder.

Suction valve 1
Suction valve 2

Supplies the brake fluid from master cylinder to the pump.

ABS IN valve

Switches the fluid pressure line to increase or hold according.

ABS OUT valve

Switches the fluid pressure line to increase, hold or decrease according.

return check valve

Returns the brake fluid from each brake to master cylinder by bypassing orifice of each valve when
brake is released.

Reservoir

Temporarily reserves the brake fluid drained from each brake, so that pressure efficiently decreases
when decreasing pressure of each brake.

Pressure sensor

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

Component parts

Function

Condition (status)

ABS warning lamp

Brake warning lamp

VDC warning lamp

Ignition switch OFF

OFF

For approx. 1 second after the ignition switch is turned ON

Approx. 1 second after ignition switch is turned ON (when the before
engine starts, system is in normal operation)

OFF

After engine starts

OFF

When parking brake operates (parking brake switch ON)

OFF

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

OFF

VDC function is malfunctioning

OFF

TCS function is malfunctioning

OFF

ABS function is malfunctioning

OFF

EBD function is malfunctioning

Brake limited slip differential (BLSD) function is malfunctioning

OFF

Brake assist function is malfunctioning

OFF

Brake force distribution function is malfunctioning

OFF

hill start assist function is malfunctioning

OFF

Advanced hill descent control function is malfunctioning

OFF

Brake vacuum sensor function is malfunctioning

OFF

VDC function is operating

OFF

Blinking

TCS function is operating

OFF

Blinking

ABS function is operating

OFF

EBD function is operating

OFF

Brake limited slip differential (BLSD) function is operating

OFF

Blinking

Brake assist function is operating

OFF

Brake force distribution function is operating

OFF

hill start assist function is operating

OFF

Advanced hill descent control function is operating

OFF

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