In the case of a decoupling thrust of the type comprising a drive member 20 adapted to act by pulling on the inner face of the device declutching 11, such as a diaphragm, by means of an annular piece of the fitting 13 preassembled declutching on the device, and a ring 40 being provided to ensure the securement of the connecting piece 13 with respect to a piece of attack 25 with the help of an elastic holding member 50 is put in compression between the piece of attack 25 and the connecting piece 13; according to the invention, this elastic holding member 50 is incorporated in the assembly under - premounted that constitutes the connecting piece 13 with the device declutching 11.
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