Method for forming an interlocked connection between a housing made from a deformable material for a service brake cylinder of a combined service brake and spring-loaded brake cylinder, a movable membrane that delimits a service brake chamber of the service brake cylinder that can be ventilated and bled, and a partition wall between the service brake cylinder and a spring-loaded brake cylinder of the combined service brake and spring-loaded brake cylinder, wherein the housing of the service brake cylinder has a rim flange, the partition wall has a first rim flange and the membrane has a fastening rim, characterized by the following process steps: a) at least the partition wall and the membrane are placed axially from above into a holder of a crimping tool, b) segments (54a to 54d) of a multi-component die of the crimping tool are moved from a radially outer starting position to a radially inner end position, in which they form a mutual contact at least with the first rim flange of the partition wall and a contour, rounded in cross-section, a distance away therefrom, c) the housing of the service brake cylinder is positioned in an annular ram of the crimping tool in such manner that the rim flange of the housing of the service brake cylinder is axially aligned with the said rounded contour, d) starting from an upper position the annular ram of the crimping tool, together with the housing of the service brake cylinder, is moved in a single stroke from above in the direction toward the die in such manner that the rim flange of the housing of the service brake cylinder is pressed against the rounded contour of the die until the rim flange is plastically deformed so that it envelops the fastening rim of the membrane and the first rim flange of the partition wall, and e) before step a) a second rim flange of the partition wall extending away from the first rim flange in the axial direction and a distance away therefrom is detachably connected to the housing of the spring-loaded brake cylinder. a) at least the partition wall and the membrane are placed axially from above into a holder of a crimping tool, b) segments (54a to 54d) of a multi-component die of the crimping tool are moved from a radially outer starting position to a radially inner end position, in which they form a mutual contact at least with the first rim flange of the partition wall and a contour, rounded in cross-section, a distance away therefrom, c) the housing of the service brake cylinder is positioned in an annular ram of the crimping tool in such manner that the rim flange of the housing of the service brake cylinder is axially aligned with the said rounded contour, d) starting from an upper position the annular ram of the crimping tool, together with the housing of the service brake cylinder, is moved in a single stroke from above in the direction toward the die in such manner that the rim flange of the housing of the service brake cylinder is pressed against the rounded contour of the die until the rim flange is plastically deformed so that it envelops the fastening rim of the membrane and the first rim flange of the partition wall, and e) before step a) a second rim flange of the partition wall extending away from the first rim flange in the axial direction and a distance away therefrom is detachably connected to the housing of the spring-loaded brake cylinder.