Content .. 105 106 107 108 ..

Nissan Juke F15. Manual - part 107

SYSTEM

BRC-19

< SYSTEM DESCRIPTION >

[WITH VDC]

BRC

During pressure rear LH brake caliper decreases

• Since the suction valve 2 and the ABS OUT valve close and the cut valve 2 and the ABS IN valve open, the

fluid pressure applied on the rear LH brake caliper is reduced by supplying the fluid pressure to the master

cylinder via the ABS IN valve and the cut valve 2. The pressurization for the left caliper is controlled sepa-

rately from the right caliper.

Component Parts and Function

VALVE OPERATION (ABS FUNCTION AND EBD FUNCTION)

The control unit built in the ABS actuator and electric unit (control unit) controls fluid pressure of the brake cal-

ipers, respectively, by operating each valve.

When Brake Pedal is Applied or ABS Function is in Operation (During Pressure Increases)

Component

Function

Pump

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).

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 to signals from control unit.

ABS OUT valve

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

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 and wheel cylinder to master cylinder by bypassing orifice
of each valve when brake is released.

Reservoir

Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreas-
es when decreasing pressure of brake caliper and wheel cylinder.

JSFIA0649GB

Name

Not activated

During pressure increases

Cut valve 1

Power supply is not supplied (open)

Cut valve 2

Power supply is not supplied (open)

BRC-20

< SYSTEM DESCRIPTION >

[WITH VDC]

SYSTEM

During pressure front RH brake caliper increases

• When the cut valve 2 and the ABS IN valve opens, brake fluid is supplied to the front RH brake caliper from

the master cylinder through the ABS IN valve. Brake fluid does not flow into the reservoir because the ABS

OUT valve is closed.

During pressure front LH brake caliper increases

• When the cut valve 1 and the ABS IN valve opens, brake fluid is supplied to the front LH brake caliper from

the master cylinder through the ABS IN valve. Brake fluid does not flow into the reservoir because the ABS

OUT valve is closed.

During pressure rear RH brake caliper increases

• When the cut valve 1 and the ABS IN valve opens, brake fluid is supplied to the rear RH brake caliper from

the master cylinder through the ABS IN valve. Brake fluid does not flow into the reservoir because the ABS

OUT valve is closed.

During pressure rear LH brake caliper increases

• When the cut valve 2 and the ABS IN valve opens, brake fluid is supplied to the rear LH brake caliper from

the master cylinder through the ABS IN valve. Brake fluid does not flow into the reservoir because the ABS

OUT valve is closed.

When ABS Function is Starts Operating (During Pressure Holds)

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 caliper (fluid pressure)

—

Pressure increases

Name

Not activated

During pressure increases

JSFIA0650GB

Name

Not activated

During 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)

SYSTEM

BRC-21

< SYSTEM DESCRIPTION >

[WITH VDC]

BRC

During pressure front RH brake caliper holds

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

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

When ABS Function is in Operation (During Pressure Decreases)

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 caliper (fluid pressure)

—

Pressure holds

Name

Not activated

During pressure holds

JSFIA0651GB

Name

Not activated

During 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 caliper (fluid pressure)

—

Pressure decreases

BRC-22

< SYSTEM DESCRIPTION >

[WITH VDC]

SYSTEM

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 master cylinder 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 master cylinder 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 master cylinder 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 master cylinder by the pump.

When ABS Function is in Operation (During Pressure Increases)

During pressure front RH brake caliper increases

JSFIA0649GB

Name

Not activated

During pressure increases

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 caliper (fluid pressure)

—

Pressure increases

Content .. 105 106 107 108 ..