The invention provides a method for mounting a friction disc on a rotor. The friction disc is reduced in diameter by means of a pair of pliers. The friction disc has an inner ring part and an outer ring part joined together by means of crossarms. The friction disc is inserted with reduced diameter into a depression of the rotor by sliding the inner ring part axially with respect to the outer ring part. The tension on the pair of pliers is relieved to allow the diameter of the friction disc to expand in the depression of the rotor. The friction disc can then be secured in the rotor by means of a central screw.