Content .. 110 111 112 113 ..

Nissan Versa Note. Instruction - part 112

BRC-12

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

SYSTEM

Front RH brake caliper

• Brake fluid is conveyed to the pump from the master cylinder through suction valve 1 and is pressurized by

the pump operation. The pressurized brake fluid is supplied to the front RH brake caliper through the ABS IN

valve. For the left caliper, brake fluid pressure is maintained because the pressurization is unnecessary. The

pressurization for the left caliper is controlled separately from the right caliper.

Front LH brake caliper

• Brake fluid is conveyed to the pump from the master cylinder through suction valve 2 and is pressurized by

the pump operation. The pressurized brake fluid is supplied to the front LH brake caliper through the ABS IN

valve. For the right caliper, brake fluid pressure is maintained because the pressurization is unnecessary.

The pressurization for the right caliper is controlled separately from the left caliper.

Rear RH wheel cylinder

• Brake fluid is conveyed to the pump from the master cylinder through suction valve 2 and is pressurized by

the pump operation. The pressurized brake fluid is supplied to the rear RH wheel cylinder through the ABS

IN valve. For the left wheel cylinder, brake fluid pressure is maintained because the pressurization is unnec-

essary. The pressurization for the left wheel cylinder is controlled separately from the right wheel cylinder.

Rear LH wheel cylinder

• Brake fluid is conveyed to the pump from the master cylinder through suction valve 1 and is pressurized by

the pump operation. The pressurized brake fluid is supplied to the rear LH wheel cylinder through the ABS

IN valve. For the right wheel cylinder, brake fluid pressure is maintained because the pressurization is

unnecessary. The pressurization for the right wheel cylinder is controlled separately from the left wheel cylin-

der.

VDC and TCS Functions Start Operating (Pressure Holds)

ABS OUT valve

Power supply is not supplied (close)

Each brake caliper and each wheel cylinder
(fluid pressure)

—

Pressure increases

Name

Not activated

Pressure increases

JSFIA0677GB

SYSTEM

BRC-13

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

BRC

Front RH brake caliper

• Since the cut valve 1 and the suction valve 1 are closed, the front RH brake caliper, master cylinder, and res-

ervoir are blocked. This maintains fluid pressure applied on the front RH brake caliper. The pressurization for

the left caliper is controlled separately from the right caliper.

Front LH brake caliper

• Since the cut valve 2 and the suction valve 2 are closed, the front LH brake caliper, master cylinder, and res-

ervoir are blocked. This maintains fluid pressure applied on the front LH brake caliper. The pressurization for

the right caliper is controlled separately from the left caliper.

Rear RH wheel cylinder

• Since the cut valve 2 and the suction valve 2 are closed, the rear RH wheel cylinder, master cylinder, and

reservoir are blocked. This maintains fluid pressure applied on the rear RH wheel cylinder. The pressuriza-

tion for the left wheel cylinder is controlled separately from the right wheel cylinder.

Rear LH wheel cylinder

• Since the cut valve 1 and the suction valve 1 are closed, the rear LH wheel cylinder, master cylinder, and

reservoir are blocked. This maintains fluid pressure applied on the rear LH wheel cylinder. The pressuriza-

tion for the right wheel cylinder is controlled separately from the left wheel cylinder.

VDC and TCS Functions Operating (Pressure Decreases)

Name

Not activated

Pressure holds

Cut valve 1

Power supply is not supplied (open)

Power supply is supplied (close)

Cut valve 2

Power supply is not supplied (open)

Power supply is supplied (close)

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 and wheel cylinder (fluid
pressure)

—

Pressure holds

JSFIA0678GB

BRC-14

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

SYSTEM

Front RH brake caliper

• Since the suction valve 1 and the ABS OUT valve are closed and the cut valve 1 and the ABS IN valve are

open, the fluid pressure applied on the front RH brake caliper is reduced by supplying the fluid pressure to

the master cylinder via the ABS IN valve and the cut valve 1. The pressurization for the right caliper is con-

trolled separately from the left caliper.

Front LH brake caliper

• Since the suction valve 2 and the ABS OUT valve are closed and the cut valve 2 and the ABS IN valve are

open, the fluid pressure applied on the front 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 con-

trolled separately from the right caliper.

Rear RH wheel cylinder

• Since the suction valve 2 and the ABS OUT valve are closed and the cut valve 2 and the ABS IN valve are

open, the fluid pressure applied on the rear RH wheel cylinder 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 right wheel cylinder

is controlled separately from the left wheel cylinder.

Rear LH wheel cylinder

• Since the suction valve 1 and the ABS OUT valve are closed and the cut valve 1 and the ABS IN valve are

open, the fluid pressure applied on the rear LH wheel cylinder is reduced by supplying the fluid pressure to

the master cylinder via the ABS IN valve and the cut valve 1. The pressurization for the left wheel cylinder is

controlled separately from the right wheel cylinder.

Component Parts and Function

VALVE OPERATION (ABS AND EBD FUNCTIONS)

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

calipers by operating each valve.

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)

ABS OUT valve

Power supply is not supplied (close)

Each brake caliper and each wheel cylinder
(fluid pressure)

—

Pressure decreases

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.

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.

Pressure sensor

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

SYSTEM

BRC-15

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

BRC

Brake Pedal Applied or ABS Function Operating (Pressure Increases)

Front RH brake caliper

• When the cut valve 1 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.

Front LH brake caliper

• When the cut valve 2 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.

Rear RH wheel cylinder

• When the cut valve 2 and the ABS IN valve opens, brake fluid is supplied to the rear RH wheel cylinder from

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

OUT valve is closed.

Rear LH wheel cylinder

• When the cut valve 1 and the ABS IN valve opens, brake fluid is supplied to the rear LH wheel cylinder from

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

OUT valve is closed.

JSFIA0679GB

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 and each wheel cylinder
(fluid pressure)

—

Pressure increases

Content .. 110 111 112 113 ..