Abstract: An electrical brush has a brush wear sensor incorporated in the brush body to indicate when the brush has worn to a predetermined point. The sensor comprises a length of insulated electrical wire doubled back onto itself intermediate its ends and located in a passageway, preferably a blind bore, extending from a surface remote from the wear surface at least to the point at which brush wear is to be sensed. The end of the doubled back portion extends to the point at which wear is to be sensed, and the ends extend from the brush body for connection to one or more electrical sensors. A cement in the passageway retains the doubled wire, and the wires of the doubled wire may be twisted or looped about each other to increase adherence and retention. When the brush wears to the tip of the doubled wire, the wire insulation wears away, and contact of the conducting wire or wires with the commutator or the like is sensed.