| 摘要 |
In a hydraulic control apparatus for a vehicle automatic transmission, a check valve is provided parallel to a first oil passageway switching valve and a third oil passageway switching valve between an output port of a linear solenoid valve and a brake, and the check valve permits pressure oil to flow from the brake to the output port side, and blocks the flow thereof in the opposite direction. Therefore, the pressure oil from the brake when the brake is released is supplied to the output port via the check valve, not via the first or third oil passageway switching valve. Therefore, when the brake is released, the engaging pressure of the brake can be controlled by the linear solenoid valve, and the positions of the first and third oil passageway switching valves are not restricted.
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