1. The stabilizer for the lower link and / or upper link of the three-point suspension system of an agricultural tractor, while the stabilizer (1) has at least one telescope (8), consisting of a pipe (5) and a piston (6), held in it bias, and the pipe and piston are connected elastically to each other by means of at least one spring (7), while the piston (6) is made with the possibility of regulation in length by rotation by means of at least one thread (12, 13), and at least one holding bracket (15) is installed with rotation on the pipe (5), and the holding bracket in the holding position engages over at least one stop (17) of the piston (6), and in the release position the telescope (8) has the possibility of free movement, characterized in that the stop (17) formed by at least one substantially rotationally symmetrical disk, and thus, the length of the piston is adjustable at or near the holding position in which the telescope (8) is held. 2. The stabilizer according to claim 1, characterized in that at least one fixing bracket (19) acts on the piston (6), and the holding bracket interacts with the stop (17) or with the additional stop (21) of the pipe (5) or piston (6 ) to prevent rotation of the piston (6). 3. The stabilizer according to claim 2, characterized in that the locking bracket (19) is rotatable to the operating position so that the locking bracket (19) can be used as a handle for rotating the piston (6) .4. The stabilizer according to claim 2 or 3, characterized in that the additional stop (21) of the fixing bracket (19) is formed by an elastically held button (22), which is elastically loaded1. Стабилизатор для нижнего звена и/или верхнего звена системы трехточечной подвески сельскохозяйственного трактора, при этом стабилизатор (1) имеет по меньшей мере один телескоп (8), состоящий из трубы (5) и поршня (6), удерживаемого в ней с возможностью смещения, причем труба и поршень соединены упруго друг с другом посредством по меньшей мере одной пружины (
