Well it's ok now.
The mechanics ask me : "who is the dummy guy have tightened this wheel nut so extremely ??" and when I say: "you, the last time you have controled my brakes..." he was not very proud...
So he cheked the four wheels (remove the nuts, and refixed once again with a kind of gold cream and gave me the rest of this grease..) and pay nothing.
Thank you all for the replies...[?]
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