Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Valve Operation
2012 Nissan-Datsun NV1500 SSECTION Valve Operation
Each valve is operated and fluid pressure of brake caliper is controlled.
When Ordinary Brake Is Applied
| Name | Not activated | When depressing brake pedal |
|---|---|---|
| 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 caliper (fluid pressure) | - | Pressure increases |
Front RH caliper
- Pressurized brake fluid from accumulator is supplied to front RH caliper through master cylinder part, cut valve 1 and ABS IN valve.
Front LH caliper
- Pressurized brake fluid from accumulator is supplied to front LH caliper through master cylinder part, cut valve 1 and ABS IN valve.
Rear RH caliper
- Pressurized brake fluid from accumulator is supplied to rear RH caliper through master cylinder part, cut valve 2 and ABS IN valve.
Rear LH caliper
- Pressurized brake fluid from accumulator is supplied to rear LH caliper through master cylinder part, cut valve 2 and ABS IN valve.
ABS Is Operating (When Pressure Increases)
| Name | Not activated | When Pressure Increases |
|---|---|---|
| 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 not supplied (open) |
| Suction valve 1 | Power supply is not supplied (close) | Power supply is supplied (open) |
| 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 caliper (fluid pressure) | - | Pressure increases |
Front RH caliper
- Pressurized brake fluid from accumulator is supplied to front RH caliper through master cylinder part, cut valve 2, suction valve 1 and ABS IN valve.
Front LH caliper
- Pressurized brake fluid from accumulator is supplied to front LH caliper through master cylinder part, cut valve 2, suction valve 1 and ABS IN valve.
Rear RH caliper
- Pressurized brake fluid from accumulator is supplied to rear RH caliper through master cylinder part, cut valve 2 and ABS IN valve.
Rear LH caliper
- Pressurized brake fluid from accumulator is supplied to rear LH caliper through master cylinder part, cut valve 2 and ABS IN valve.
ABS Is Operating (When Pressure Holds)
| Name | Not activated | When Pressure Increases |
|---|---|---|
| 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 not supplied (open) |
| Suction valve 1 | Power supply is not supplied (close) | Power supply is supplied (open) |
| 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 caliper (fluid pressure) | - | Pressure holds |
Front RH caliper
- ABS IN valve is close, fluid pressure of front RH caliper is holds.
Front LH caliper
- ABS IN valve is close, fluid pressure of front LH caliper is holds.
Rear RH caliper
- ABS IN valve is close and fluid pressure of rear RH caliper is holds.
Rear LH caliper
- ABS IN valve is close and fluid pressure of rear LH caliper is holds.
ABS Is Operating (When Pressure Decreases)
| Name | Not activated | When pressure decreases |
|---|---|---|
| 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 not supplied (open) |
| Suction valve 1 | Power supply is not supplied (close) | Power supply is supplied (open) |
| 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 caliper (fluid pressure) | - | Pressure decreases |
Front RH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of front RH caliper is decreased.
Front LH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of front LH caliper is decreased.
Rear RH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of rear RH caliper is decreased.
Rear LH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of rear LH caliper is decreased.
VDC Is Operating (When Pressure Increases)
| Name | Not activated | When pressure increases |
|---|---|---|
| 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) | Power supply is supplied (open) |
| Suction valve 2 | Power supply is not supplied (close) | Power supply is supplied (open) |
| ABS IN valve | Power supply is not supplied (open) | Only in wheel that the pressure is to be increased: Power supply is not supplied (open) Wheel other than the one that the pressure is to be increased: Power supply is supplied (close) |
| ABS OUT valve | Power supply is not supplied (close) | Power supply is not supplied (close) |
| Each caliper (fluid pressure) | - | Pressure increases (only in wheel that the pressure is to be increased) |
Front RH caliper
- Pressurized brake fluid from accumulator is supplied to front RH caliper through suction valve 2, suction valve 1 and ABS IN valve. When not increasing, ABS IN valve is closed and brake fluid is not supplied to front RH caliper.
Front LH caliper
- Pressurized brake fluid from accumulator is supplied to front LH caliper through suction valve 2, suction valve 1 and ABS IN valve. When not increasing, ABS IN valve is closed and brake fluid is not supplied to front LH caliper.
Rear RH caliper
- Pressurized brake fluid from accumulator is supplied to rear RH caliper through suction valve 2 and ABS IN valve. When not increasing, ABS IN valve is closed and brake fluid is not supplied to rear RH caliper.
Rear LH caliper
- Pressurized brake fluid from accumulator is supplied to rear LH caliper through suction valve 2 and ABS IN valve. When not increasing, ABS IN valve is closed and brake fluid is not supplied to rear LH caliper.
VDC Is Operating (When Pressure Holds)
| Name | Not activated | When 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) | Power supply is supplied (open) |
| Suction valve 2 | Power supply is not supplied (close) | Power supply is supplied (open) |
| ABS IN valve | Power supply is not supplied (open) | Only wheel that the pressure is to be holds: Power supply is supplied (close) Wheel other than the one that the pressure is to be holds: Power supply is not supplied (open) |
| ABS OUT valve | Power supply is not supplied (close) | Power supply is not supplied (close) |
| Each caliper (fluid pressure) | - | Pressure holds (only wheel that the pressure is to be holds) |
Front RH caliper
- ABS IN valve is close, fluid pressure of front RH caliper is holds.
Front LH caliper
- ABS IN valve is close, fluid pressure of front LH caliper is holds.
Rear RH caliper
- ABS IN valve is close, fluid pressure of rear RH caliper is holds.
Rear LH caliper
- ABS IN valve is close, fluid pressure of rear LH caliper is holds.
VDC Is Operating (When Pressure Decreases)
| Name | Not activated | When pressure decreases |
|---|---|---|
| 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) | Power supply is supplied (open) |
| Suction valve 2 | Power supply is not supplied (close) | Power supply is supplied (open) |
| ABS IN valve | Power supply is not supplied (open) | Only in wheel that the pressure is to be decreased: Power supply is supplied (close) Wheel other than the one that the pressure is to be decreased: Power supply is not supplied (open) |
| ABS OUT valve | Power supply is not supplied (close) | Only in wheel that the pressure is to be decreased: Power supply is supplied (open) Wheel other than the one that the pressure is to be decreased: Power supply is not supplied (close) |
| Each caliper (fluid pressure) | - | Pressure decreases (only in wheel that the pressure is to be decreased) |
Front RH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of front RH caliper is decreased.
Front LH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of front LH caliper is decreased.
Rear RH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of rear RH caliper is decreased.
Rear LH caliper
- Being returned to reservoir tank through ABS OUT valve, fluid pressure of rear LH caliper is decreased.
Component Parts and Function
| Component | Function |
|---|---|
| Pump | Operates the pump drive according to signals from ABS actuator and electric unit (control unit) by the motor. |
| Motor | Operates the motor drive according to signals from ABS actuator and electric unit (control unit). |
| Accumulator | The accumulator accumulates brake fluid conveyed by the motor and pump. |
| ABS IN valve | Increases, holds or decreases the fluid pressure of each caliper according to signals from ABS actuator and electric unit (control unit). |
| ABS OUT valve | Increases, holds or decreases the fluid pressure of each caliper 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 to signals from ABS actuator and electric unit (control unit). |
| Suction valve 1 | Suction valve 1 switches the brake line to convey accumulator pressure to the front system, according to a signal transmitted from the ABS actuator and electric unit (control unit). |
| Suction valve 2 | Suction valve 2 releases accumulator pressure, according to a signal transmitted from the ABS actuator and electric unit (control unit). |
| Accumulator pressure sensor | The accumulator pressure sensor detects brake fluid pressure accumulated in the accumulator and conveys the detected result to the ABS actuator and electric unit (control unit). |
| Master cylinder pressure sensor | Detects the brake fluid pressure of master cylinder part and transmits a signal to ABS actuator and electric unit (control unit). |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.