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 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 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 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. <EOS>