Abstract: The caliper (52), in the form of a closed frame surrounding the fixed support (50), incorporates at least one axial reinforcing member (3) joining two axially separated zones (1, 2) of the caliper by passing through them and extending radially beyond the periphery of the disc (53). The reinforcing member incorporates a head (4), which is received within a complementary recess in the first zone of the caliper (1), and a threaded end cooperating with first and second locking and tightening elements, cooperating with each other (for example a locking nut 5 and a removable washer 10) of which the first elements is lockable on the threaded end so as to give, together with the second element, a predetermined tension to the reinforcing member, the second element being capable of being selectively disengaged to allow the reinforcing member to be separated (by tilting or longitudinal displacement) from the second zone (2) of the caliper.