A drum for a drum brake manufactured as a single part from aluminium alloy. The drum includes a central axis, a rear wall connectable to a wheel and extending perpendicular to the central axis, a circumferential wall extending parallel to the central axis, and a transition area coupling the circumferential wall with the rear wall. The circumferential wall has an inner face and an outer portion, the inner face defines a braking surface for being contacted by shoes of the drum brake. The outer portion includes a radially projecting heat dissipating mass. The circumferential wall has in the outer portion a first segment free of the heat dissipating mass and a second segment in which the heat dissipating mass is arranged and extends from the first segment, such that the circumferential wall is thicker in the second segment than in the first segment.

A hydraulic brake valve system may comprise a valve housing comprising a brake port, a pressure port, a return port, and a valve actuation end; a valve shaft coupled to the valve actuation end, wherein the valve shaft may be comprised at least partially within the valve housing; and an electric actuator coupled to the valve shaft, wherein the electric actuator may be configured to move the valve shaft between a shaft on position and a shaft off position. The hydraulic brake valve system may be configured to pass hydraulic pressure through at least one of the brake port, the pressure port, or the return port in response to a position of the valve shaft.