Nissan Quest E52. Instruction — part 231
SYSTEM
BRC-17
< SYSTEM DESCRIPTION >
[WITH VDC]
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The following descriptions explains the control of front brake right side, as an example.
Under Normal Brake Operation
Since power is not supplied to the ABS IN valve and the ABS OUT valve, the ABS IN valve port is open and
the ABS OUT valve port is closed. This allows the master cylinder fluid pressure to be sent to the front RH cal-
iper and blocks the brake fluid passage to the reservoir.
When Pressure Increases
The control unit pressurizes the inside of the brake caliper by opening the ABS IN valve port and closing the
ABS OUT valve port. After breaking the circuit, the valves operate in the same way as described in “Under
Normal Brake Operation.” The fluid amount supplied from the master cylinder to the brake caliper is controlled,
according to the power supply cut-off time (time to open the port) to the ABS IN valve.
When Pressure Holds
JSFIA0969GB
BRC-18
< SYSTEM DESCRIPTION >
[WITH VDC]
SYSTEM
The control unit passes an electric current to the ABS IN valve and closes the ABS IN valve port. Since power
is not supplied to the ABS OUT valve, its port is closed. The paths to the brake caliper, master cylinder, and
reservoir are cut off. This allows the front RH caliper fluid pressure to be maintained.
When Pressure Decreases
The control unit closes the ABS IN valve port and opens the ABS OUT valve port by supplying power to the
ABS IN valve and the ABS OUT valve. The brake fluid of the front RH caliper passes through the ABS OUT
valve to the reservoir and stays in the reservoir. After this the brake fluid is pumped up to return to the master
cylinder.
When brake released
The fluid pressure returns from the front RH caliper to the master cylinder through the return check valve
opened by the ABS IN valve port and fluid pressure.
Component Parts and Function
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.
CONDITION FOR TURN ON THE INDICATOR LAMP
Component
Function
Pump
Feeds brake fluid by the motor.
Motor
Activates the pump according to signals from ABS actuator and electric unit (control unit).
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.
Cut valve 1
Cut valve 2
Shuts off the ordinary brake line from master cylinder, when VDC function, TCS function and brake
limited slip differential (BLSD) function are activated.
Suction valve 1
Suction valve 2
Supplies the brake fluid from master cylinder to the pump, when VDC function, TCS function and
brake limited slip differential (BLSD) function are activated.
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.
Pressure sensor
Detects the brake fluid pressure and transmits signal to control unit.
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.
Damper
Reduces the vibrations travelling to the brake pedal during the operation of the VDC function, TCS
function, ABS function, EBD function, or brake limited slip differential (BLSD) function.
Condition (status)
ABS warning lamp
Brake warning lamp
VDC warning lamp
Ignition switch OFF
OFF
OFF
OFF
For approx. 2 seconds after the ignition switch is turned ON
ON
ON
ON
Approx. 2 seconds after ignition switch is turned ON (when the sys-
tem is in normal operation)
OFF
OFF
OFF
When parking brake operates (parking brake switch ON)
OFF
ON
OFF
When brake fluid is less than the specified level (brake fluid level
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
VDC function is operating
OFF
OFF
Blinking
TCS function is operating
OFF
OFF
Blinking
SYSTEM
BRC-19
< SYSTEM DESCRIPTION >
[WITH VDC]
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• Turns ON when VDC function and TCS function are switched to non-operational status (OFF) by VDC OFF
switch.
• Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.
Condition (status)
VDC OFF indicator lamp
Ignition switch OFF
OFF
For approx. 2 seconds after the ignition switch is turned ON
ON
Approx. 2 seconds after ignition switch is turned ON (when the sys-
tem is in normal operation)
OFF
When VDC OFF switch is ON (VDC function and TCS function are
OFF)
ON
BRC-20
< SYSTEM DESCRIPTION >
[WITH VDC]
SYSTEM
Circuit Diagram
INFOID:0000000009651358
Fail-safe
INFOID:0000000009651359
VDC FUNCTION, TCS FUNCTION AND BRAKE LIMITED SLIP DIFFERENTIAL (BLSD) FUNCTION
VDC warning lamp in combination meter turn ON when a malfunction occurs in system [ABS actuator and
electric unit (control unit)]. The control is suspended for VDC function, TCS function and brake limited slip dif-
JSFIA0970GB
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