SUSPENSION SYSTEM OF A VEHICLE AXLE

The invention relates to a suspension system of a vehicle axle, comprising: —a leaf spring (); —a rear attachment device () which is configured to be secured to a vehicle frame () and which receives a rear end portion () of the leaf spring () so as to allow said leaf spring rear end portion to slide longitudinally relative to the rear attachment device; wherein: —the leaf spring rear end portion () forms at least part of a loop curved around a transverse axis, the loop being longitudinally elongated and having an opening () located at least at the front of said loop; —the rear attachment device () comprises a fastener () extending substantially transversally and received in said loop; —and the suspension system further comprises retaining means () configured to prevent the fastener () from getting out of the loop through the opening ().