Driveline assembly park brake for a work vehicle

A work vehicle comprising:

• a chassis carrying a power source;
• a plurality of ground-engaging members supporting the chassis off the ground;
• a driveline carried by the chassis and configured to deliver power from the power source to the plurality of ground-engaging members, the driveline including:
• a casing configured to couple to the work vehicle and defining an internal cavity containing cooling fluid;
• a driveshaft at least partially disposed in the internal cavity and rotatable about a drive axis with respect to the casing;
• and
• a friction pack contained within the internal cavity of the casing and arranged concentrically about the drive axis, the friction pack including a plurality of support plates and a plurality of friction discs alternatingly interleaved with the plurality of support plates, the plurality of support plates being mounted for corotation with the driveshaft relative to the plurality of friction discs, the friction discs being mounted to the casing or another component fixed with respect to the casing, the plurality of friction discs extending radially outward from the drive axis farther than the plurality of support plates, the plurality of support plates having opposite faces that are smooth relative to the friction discs and the plurality of friction discs having opposite faces that are rough relative to the support plates;
• wherein cooling fluid is limited to a maximum fill level within the internal cavity of the casing that is below the drive axis of the driveshaft such that a portion but not all of the bearing is submerged in the cooling fluid.