The invention mainly relates to a spiral spring (36) of a brush holder for a motor vehicle starter. Said spiral spring includes: - a rolled-up portion (37) having a plurality of turns (371); and - an arm (39) for engaging one surface of a brush of the brush holder. The invention is characterized in that said spiral spring (36) also comprises a means (42) for reducing the friction between at least two adjacent turns (371) of said rolled-up portion (37).
