Method of manufacturing a torsion spring comprising a wire comprising a plurality of turns wherein each turn is centered on a turn axis (Xi), while the torsion spring is designed to be mounted within a spring brake and to be in radial frictional contact with a friction member of the spring brake, wherein the manufacturing method comprises a step f) of conformation and cutting comprising the following substeps: - f1) winding conformation of a raw wire according to a plurality of raw turns, so that each raw turn is substantially coaxial with a common main axis, wherein the raw wire has: o a first raw portion extending from a first end of the raw wire over at least one raw turn, o a second raw portion extending from a second end of the raw wire, opposite the first end of the raw wire over at least one raw turn, and o an intermediate portion between the first raw portion and the second raw portion, - f2) separation by cutting the first raw portion and the second raw portion of the raw wire after the implementation of the substep f1), wherein the intermediate portion then becomes the wire of the torsion spring, and wherein at least a portion of the raw turns of the intermediate portion become the turns of the torsion spring, and - f3) conformation by folding of a first tab at a first end of the intermediate portion after the substep f1) and before or after the substep f2), the first tab being curved, the curvature of the first tab corresponding substantially to the curvature of the turns, and - f4) conformation by folding of a second tab at a second end of the intermediate portion opposite the first end, after the substep f1) and before or after the substep f2), the second tab being curved, the curvature of the second tab corresponding substantially to the curvature of the turns, the torsion spring being designed to interact with members exerting torques around the main axis of the spring, the torques being applied to the first tab and to the second tab. - f1) winding conformation of a raw wire according to a plurality of raw turns, so that each raw turn is substantially coaxial with a common main axis, wherein the raw wire has: o a first raw portion extending from a first end of the raw wire over at least one raw turn, o a second raw portion extending from a second end of the raw wire, opposite the first end of the raw wire over at least one raw turn, and o an intermediate portion between the first raw portion and the second raw portion, o a first raw portion extending from a first end of the raw wire over at least one raw turn, o a second raw portion extending from a second end of the raw wire, opposite the first end of the raw wire over at least one raw turn, and o an intermediate portion between the first raw portion and the second raw portion, - f2) separation by cutting the first raw portion and the second raw portion of the raw wire after the implementation of the substep f1), wherein the intermediate portion then becomes the wire of the torsion spring, and wherein at least a portion of the raw turns of the intermediate portion become the turns of the torsion spring, and - f3) conformation by folding of a first tab at a first end of the intermediate portion after the substep f1) and before or after the substep f2), the first tab being curved, the curvature of the first tab corresponding substantially to the curvature of the turns, and - f4) conformation by folding of a second tab at a second end of the intermediate portion opposite the first end, after the substep f1) and before or after the substep f2), the second tab being curved, the curvature of the second tab corresponding substantially to the curvature of the turns, the torsion spring being designed to interact with members exerting torques around the main axis of the spring, the torques being applied to the first tab and to the second tab.