An electric motor comprising: a stator; an armature rotatably received within the stator, the armature having an armature shaft on which a commutator is mounted; and a brush assembly disposed around the commutator and defining a first surface facing the stator and a second surface opposite the first surface, the brush assembly comprising: a brush card mount formed with a plurality of radial openings therein, each opening of which plurality of radial openings is formed between respective separate planar pieces of the brush card mount, which separate planar pieces are connected together via a ring of the brush assembly; a plurality of brushes in sliding contact with the commutator to supply electric current to the commutator; a plurality of thermally-conductive brush holders disposed on the second surface of the brush assembly to house the plurality of brushes and secured to the brush card mount by sliding engagement between a respective brush holder and a respective one of the plurality of radial openings; each brush holder including a plurality of projections (456, 458) formed along a length of an outer surface of the brush holder to increase a total surface area of the brush holder and transfer heat away from the brush holder. a stator; an armature rotatably received within the stator, the armature having an armature shaft on which a commutator is mounted; and a brush assembly disposed around the commutator and defining a first surface facing the stator and a second surface opposite the first surface, the brush assembly comprising: a brush card mount formed with a plurality of radial openings therein, each opening of which plurality of radial openings is formed between respective separate planar pieces of the brush card mount, which separate planar pieces are connected together via a ring of the brush assembly; a plurality of brushes in sliding contact with the commutator to supply electric current to the commutator; a plurality of thermally-conductive brush holders disposed on the second surface of the brush assembly to house the plurality of brushes and secured to the brush card mount by sliding engagement between a respective brush holder and a respective one of the plurality of radial openings; each brush holder including a plurality of projections (456, 458) formed along a length of an outer surface of the brush holder to increase a total surface area of the brush holder and transfer heat away from the brush holder. a brush card mount formed with a plurality of radial openings therein, each opening of which plurality of radial openings is formed between respective separate planar pieces of the brush card mount, which separate planar pieces are connected together via a ring of the brush assembly; a plurality of brushes in sliding contact with the commutator to supply electric current to the commutator; a plurality of thermally-conductive brush holders disposed on the second surface of the brush assembly to house the plurality of brushes and secured to the brush card mount by sliding engagement between a respective brush holder and a respective one of the plurality of radial openings; each brush holder including a plurality of projections (456, 458) formed along a length of an outer surface of the brush holder to increase a total surface area of the brush holder and transfer heat away from the brush holder.