A brake caliper, including a caliper body including a base bearing a piston with a cylindrical external face and a movement conversion mechanism for moving this piston translationally in a main direction, this base including a cylindrical internal face in which the piston slides. The caliper includes three steel rollers interposed between the internal face of the base and the external face of the piston while being oriented along the main axis and distributed about this axis. Each roller is housed in a groove formed at the internal face of the base parallel to the main axis while being open radially towards the main axis, each cylinder extending out of this groove towards the main axis.