2ND and 4TH Brake

BRAKE MODULATOR VALVE
This valve adjusts the hydraulic pressure to the 2nd & 4th brake engagement side when the gear is in the 2nd, 3rd and 4th gears. As the line pressure is applied to (3) when in the 2nd and 4th gears, the valve is fixed at the upper position and the line pressure is transmitted as it is from (4) to (2) . When in the 3rd gear, as the line pressure is not applied to (3) and the valve is held by spring force, the hydraulic pressure (line pressure) applied to (4) is adjusted and transmitted to (2) .

As a result, the hydraulic pressures (1) and (2) that work on the second brake engagement side are adjusted at a higher level as compared with when in the 3rd gear.





BRAKE MODULATOR CONTROL VALVE
This valve controls switching of the hydraulic pressure to the 2nd and 4th brake modulator valve when in the 2nd and 4th gears.

When in the 2nd gear, as the hydraulic pressure is not applied to (2), the valve moves up. The hydraulic pressure (line pressure) applied to (3) passes through the valve and (1) to act on the 2nd and 4th brake modulator valve.

When in the 4th gear, as the hydraulic pressure passes through (2), the valve moves down. Then the hydraulic pressure (line pressure) applied to (4) passes through the valve and (1) to act on the 2nd and 4th brake modulator valve.