Hydraulically brakeable electrical machine

An electrical machine comprising a rotor, a stator, a housing and a first and a second fluid chamber in fluid communication via at least one fluid passage of the rotor and at least one fluid return passage provided between the first fluid chamber and the second fluid chamber, wherein the rotor upon rotation is adapted to provide a difference in pressure between the first fluid chamber and the second fluid chamber by transfer of fluid there between, whereby a braking torque is exerted on the rotor, wherein the first and second fluid chambers are provided at, along a rotational axis of the electrical machine, respective opposite sides of the rotor.