Method for producing a rubber spring, wherein the method comprises the following steps: a) providing a moulding tool which has a plurality of moulding tool parts (6, 8), wherein the moulding tool is configured such that the moulding tool can be moved between a closed position, in which the moulding tool parts (6, 8) enclose a moulding chamber, and an open position, in which the moulding tool parts (6, 8) are at least partially spaced apart from one another and, as a result, the moulding chamber is accessible from the outside, and wherein, in the closed position, the moulding tool forms a mould surface which encloses the moulding chamber and which has a plurality of channel openings which each lead to inflow channels; b) moving the moulding tool into the open position; c) inserting a head connection unit and a foot connection unit into receiving seats (22, 24) which are configured on the mould surface of the moulding tool, wherein the head connection unit comprises at least one upper plate which is configured for fastening of an air spring bellows, and wherein the foot connection unit comprises at least one connection plate which is configured for fastening to a chassis of a vehicle; d) moving the moulding tool into the closed position, wherein the channel openings are arranged distributed in a lateral portion of the mould surface between the receiving seats (22, 24); e) conveying a first rubber material through the inflow channels and the channel openings into the moulding chamber of the moulding tool, which is in the closed position; f) conveying a second rubber material through the inflow channels and the channel openings into the moulding chamber, after step e) has ended, wherein the second rubber material contains flame retardant and the moulding tool remains in the closed position between step e) and f); and g) joint vulcanization of the first and second rubber material, such that this, together with the head connection unit and the foot connection unit, produces a rubber spring. a) providing a moulding tool which has a plurality of moulding tool parts (6, 8), wherein the moulding tool is configured such that the moulding tool can be moved between a closed position, in which the moulding tool parts (6, 8) enclose a moulding chamber, and an open position, in which the moulding tool parts (6, 8) are at least partially spaced apart from one another and, as a result, the moulding chamber is accessible from the outside, and wherein, in the closed position, the moulding tool forms a mould surface which encloses the moulding chamber and which has a plurality of channel openings which each lead to inflow channels; b) moving the moulding tool into the open position; c) inserting a head connection unit and a foot connection unit into receiving seats (22, 24) which are configured on the mould surface of the moulding tool, wherein the head connection unit comprises at least one upper plate which is configured for fastening of an air spring bellows, and wherein the foot connection unit comprises at least one connection plate which is configured for fastening to a chassis of a vehicle; d) moving the moulding tool into the closed position, wherein the channel openings are arranged distributed in a lateral portion of the mould surface between the receiving seats (22, 24); e) conveying a first rubber material through the inflow channels and the channel openings into the moulding chamber of the moulding tool, which is in the closed position; f) conveying a second rubber material through the inflow channels and the channel openings into the moulding chamber, after step e) has ended, wherein the second rubber material contains flame retardant and the moulding tool remains in the closed position between step e) and f); and g) joint vulcanization of the first and second rubber material, such that this, together with the head connection unit and the foot connection unit, produces a rubber spring.