Nissan Sentra. Manual — part 157
SYSTEM
BRC-15
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
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 brake caliper/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 brake caliper/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 cal-
iper/wheel cylinder is controlled separately from the left caliper/wheel cylinder.
Rear LH brake caliper/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 brake caliper/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 cali-
per/wheel cylinder is controlled separately from the right caliper/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)
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 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).
BRC-16
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
SYSTEM
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 brake caliper/wheel cylinder
• When the cut valve 2 and the ABS IN valve opens, brake fluid is supplied to the rear RH brake caliper/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 brake caliper/wheel cylinder
• When the cut valve 1 and the ABS IN valve opens, brake fluid is supplied to the rear LH brake caliper/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.
ALFIA0335GB
Name
Not activated
During pressure increases
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 and each wheel cylinder
(fluid pressure)
—
Pressure increases
SYSTEM
BRC-17
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
ABS Function Starts Operating (Pressure Holds)
Front RH brake caliper
• 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.
Front LH brake caliper
• 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.
Rear RH brake caliper/wheel cylinder
• Since the ABS IN valve and the ABS OUT valve are closed, the rear RH brake caliper/wheel cylinder, master
cylinder, and reservoir are blocked. This maintains fluid pressure applied on the rear RH brake caliper/wheel
cylinder.
Rear LH brake caliper/wheel cylinder
• Since the ABS IN valve and the ABS OUT valve are closed, the rear LH brake caliper/wheel cylinder, master
cylinder, and reservoir are blocked. This maintains fluid pressure applied on the rear LH brake caliper/wheel
cylinder.
ALFIA0336GB
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 and each wheel cylinder
(fluid pressure)
—
Pressure holds
BRC-18
< SYSTEM DESCRIPTION >
[VDC/TCS/ABS]
SYSTEM
ABS Function Operating (Pressure Decreases)
Front RH brake caliper
• 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.
Front LH brake caliper
• 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.
Rear RH brake caliper/wheel cylinder
• Since the ABS IN valve is closed and the ABS OUT valve is opened, fluid pressure applied on the rear RH
brake caliper/wheel cylinder is supplied to the reservoir through the ABS OUT valve. This fluid pressure
decreases when sent to the master cylinder by the pump.
Rear LH brake caliper/wheel cylinder
• Since the ABS IN valve is closed and the ABS OUT valve is opened, fluid pressure applied on the rear LH
brake caliper/wheel cylinder is supplied to the reservoir through the ABS OUT valve. This fluid pressure
decreases when sent to the master cylinder by the pump.
ALFIA0337GB
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 and each wheel cylinder
(fluid pressure)
—
Pressure decreases
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