A WET DISC BRAKE

A wet disc brake (16) for an off-highway vehicle is provided. The wet disc brake (16) includes a brake caliper (20); a disc pack (22) located within the brake caliper (20) and rotatably fixed to a vehicle shaft, the shaft having a longitudinal axis extending in an inboard-outboard direction; a service piston (24) actuatable within the brake caliper (20) during a brake operation to compress the disc pack (22) to inhibit rotation of the shaft and slow the vehicle; and a parking piston (30) coaxial with the service piston (24) and actuatable within the brake caliper (20) during a parking operation to apply a force to the service piston (24) to actuate the service piston (24). At least a portion of the parking piston (30) axially overlaps the service piston (24) in the inboard-outboard direction.