Electric disc brake system comprising: - a stirrup bearing a first brake pad and a piston bearing a second brake pad to cooperate with the brake disc - a gear motor actuating the brake piston to control the clamping and unclamping movement of the brake, characterized in that it comprises: A) at least one sensor which is installed between the bottom of the brake piston and the brake stirrup combined with the brake to input a vibration signal emitted by the brake, and B) an analysis and control circuit comprising: - a frequency analysis means for decomposing the signal into its fundamental frequencies, - a comparator for comparing the envelope of the frequencies to a mask (Gi), characterized in that it defines a constant or substantially constant level for the low and medium frequencies and is continued by a decreasing limit from the medium frequencies to the high frequencies, and - a control means receiving the signal permanently for comparison to modify the clamping action of the brake by the gear motor as a function of the result of the comparison. - a stirrup bearing a first brake pad and a piston bearing a second brake pad to cooperate with the brake disc - a gear motor actuating the brake piston to control the clamping and unclamping movement of the brake, characterized in that it comprises: A) at least one sensor which is installed between the bottom of the brake piston and the brake stirrup combined with the brake to input a vibration signal emitted by the brake, and B) an analysis and control circuit comprising: - a frequency analysis means for decomposing the signal into its fundamental frequencies, - a comparator for comparing the envelope of the frequencies to a mask (Gi), characterized in that it defines a constant or substantially constant level for the low and medium frequencies and is continued by a decreasing limit from the medium frequencies to the high frequencies, and - a control means receiving the signal permanently for comparison to modify the clamping action of the brake by the gear motor as a function of the result of the comparison. A) at least one sensor which is installed between the bottom of the brake piston and the brake stirrup combined with the brake to input a vibration signal emitted by the brake, and B) an analysis and control circuit comprising: - a frequency analysis means for decomposing the signal into its fundamental frequencies, - a comparator for comparing the envelope of the frequencies to a mask (Gi), characterized in that it defines a constant or substantially constant level for the low and medium frequencies and is continued by a decreasing limit from the medium frequencies to the high frequencies, and - a control means receiving the signal permanently for comparison to modify the clamping action of the brake by the gear motor as a function of the result of the comparison. - a frequency analysis means for decomposing the signal into its fundamental frequencies, - a comparator for comparing the envelope of the frequencies to a mask (Gi), characterized in that it defines a constant or substantially constant level for the low and medium frequencies and is continued by a decreasing limit from the medium frequencies to the high frequencies, and - a control means receiving the signal permanently for comparison to modify the clamping action of the brake by the gear motor as a function of the result of the comparison.