Clutch system for a motor vehicle comprising at least: - a reaction plate intended to be coupled in rotation to a drive shaft; - a friction disk bearing friction linings and intended to be coupled in rotation with a driven shaft; - a cover fixed onto the reaction plate; - a pressure plate, secured in rotation to the cover, axially mobile relative to said cover and having a working face facing the friction linings; - a force transmission element that can be controlled by a clutch release bearing and supported, on the one hand, relative to the cover and, on the other hand, relative to the pressure plate via a brace, in order to axially displace said pressure plate relative to said cover to clamp the friction disk between the pressure plate and the reaction plate, in clutched position, or release it, in declutched position; - a wear adjustment device that makes it possible to modify the axial distance d between the working face of the pressure plate and the brace via which the force transmission element acts on the pressure plate, as a function of the wear of the friction linings, said wear adjustment device comprising: ∘ ramp means cooperating with counter-ramp means to modify said axial distance d, said ramp means bearing teeth; ∘ a worm screw and a ratchet wheel equipped with teeth coupled in rotation, said worm screw meshing with the teeth so as to actuate said ramp means; ∘ a pawl fixed to said cover, having a control tongue cooperating with the teeth of the ratchet wheel so as to drive the ratchet wheel in a direction or rotation, in case of wear, and to prevent the rotation of the ratchet wheel in the counter direction of rotation, said pawl being arranged in such a way that the force transmission element pushes the control tongue towards the ratchet wheel during a clutch operation and that the control tongue moves away from the ratchet wheel to a position of abutment in which the pawl is braced against the cover, during a declutching operation, said clutch system being characterized in that the pawl is, in its position of abutment, constrained towards the ratchet wheel so as to supply a counter return force capable of elastically returning the pawl to its position of abutment and in that the pawl has a body extending radially along the inner face of the bottom of the cover, a control tongue extending axially and a bent portion between the body and the control tongue, said bent portion being provided with an orifice allowing the passage of a radial appendage formed at the periphery of the force transmission element so that said force transmission element cooperates with the control tongue of the pawl. - a reaction plate intended to be coupled in rotation to a drive shaft; - a friction disk bearing friction linings and intended to be coupled in rotation with a driven shaft; - a cover fixed onto the reaction plate; - a pressure plate, secured in rotation to the cover, axially mobile relative to said cover and having a working face facing the friction linings; - a force transmission element that can be controlled by a clutch release bearing and supported, on the one hand, relative to the cover and, on the other hand, relative to the pressure plate via a brace, in order to axially displace said pressure plate relative to said cover to clamp the friction disk between the pressure plate and the reaction plate, in clutched position, or release it, in declutched position; - a wear adjustment device that makes it possible to modify the axial distance d between the working face of the pressure plate and the brace via which the force transmission element acts on the pressure plate, as a function of the wear of the friction linings, said wear adjustment device comprising: ∘ ramp means cooperating with counter-ramp means to modify said axial distance d, said ramp means bearing teeth; ∘ a worm screw and a ratchet wheel equipped with teeth coupled in rotation, said worm screw meshing with the teeth so as to actuate said ramp means; ∘ a pawl fixed to said cover, having a control tongue cooperating with the teeth of the ratchet wheel so as to drive the ratchet wheel in a direction or rotation, in case of wear, and to prevent the rotation of the ratchet wheel in the counter direction of rotation, said pawl being arranged in such a way that the force transmission element pushes the control tongue towards the ratchet wheel during a clutch operation and that the control tongue moves away from the ratchet wheel to a position of abutment in which the pawl is braced against the cover, during a declutching operation, ∘ ramp means cooperating with counter-ramp means to modify said axial distance d, said ramp means bearing teeth; ∘ a worm screw and a ratchet wheel equipped with teeth coupled in rotation, said worm screw meshing with the teeth so as to actuate said ramp means; ∘ a pawl fixed to said cover, having a control tongue cooperating with the teeth of the ratchet wheel so as to drive the ratchet wheel in a direction or rotation, in case of wear, and to prevent the rotation of the ratchet wheel in the counter direction of rotation, said pawl being arranged in such a way that the force transmission element pushes the control tongue towards the ratchet wheel during a clutch operation and that the control tongue moves away from the ratchet wheel to a position of abutment in which the pawl is braced against the cover, during a declutching operation,