Low Brake Solenoid Valve

The low brake solenoid valve is installed to control valve assembly.

Fig 1: Identifying Low Brake Solenoid Valve
Courtesy of NISSAN NORTH AMERICA, INC.
The low brake solenoid valve is controlled by the TCM in response to signals transmitted from the transmission range switch, output speed sensor and accelerator pedal position sensor. Gears will then be shifted to the optimum position.
The low brake solenoid valve controls the low brake control valve in response to a signal transmitted from the TCM.
The low brake solenoid valve utilizes a linear solenoid valve [N/L (normal low) type].

Fig 2: Current Versus Oil Pressure Graph
Courtesy of NISSAN NORTH AMERICA, INC.
NOTE:
- The principle of the linear solenoid valve utilizes the fact that the force pressing on the valve spool installed inside the coil increases nearly in proportion to the current. This allows it to produce a fluid pressure that is proportional to this pressing force.
- The N/L (normal low) type does not produce hydraulic control when the coil is not energized.