Hydraulic one-way disc clutch assembly

A hydraulic one-way clutch assembly (HOWC) is configured for use in a vehicle transmission. The HOWC assembly includes a non-rotatable disc and a rotatable disc. The non-rotatable disc extends about an axis and defines at least one exhaust port extending therethrough. The rotatable disc extends about the axis and is disposed axially adjacent the non-rotatable disc. The rotatable disc is configured to rotate relative to the non-rotatable disc, about the axis, between a closed position and an open position. The rotatable disc covers the exhaust passage when the rotatable disc is in the closed position to prevent fluid from flowing out through the at least one exhaust port. The rotatable disc uncovers the exhaust port when the rotatable disc is in the closed position to allow fluid to flow out through the at least one exhaust port.