the force exerted by the bearing on the end of the fingers 82 as a function of the disengagement travel will be substantially constant the wear take up device according to one characteristic has no ramp means it is for this reason that the reaction plate 3 is similar to the thrust plate 7 thus this plate 3 has at its front a support 23 in the form of a protrusion divided like the protrusion 71 the protrusion 23 has roughly the same mean diameter as the protrusion 71 but is shorter axially than the said protrusion 71 the protrusion 23 extends in axial projection in the direction of the support plate 1 radially below the protrusion 23 the support plate 1 has a protrusion 24 roughly with the same mean diameter as the primary support 85 and secondary support 84 the protrusion 24 extends in axial projection in the direction of the reaction plate 3 and the base 90 of the cover 9 the protrusions 23 and 24 just like the protrusion 71 are advantageously divided into annular sectors in order to improve ventilation according to the invention axially acting elastic compensation means 2 bear on the protrusions 23 24 these elastic means 2 act on the reaction plate 3 in the direction of the base 90 of the cover the elastic means 2 act axially in the opposite direction with respect to the diaphragm 8 that is to say in an opposing fashion the elastic compensation means form part.