SYSTEM FOR HOLDING AND STORING DISCONNECTED LINES

System for holding and storing (3) disconnected lines (5) of a tractor unit (1), each line (5) comprising, at one end, a coupling (7) configured to be coupled to a complementary coupling of a trailer so as to pneumatically or electrically connect the trailer (4) to the tractor unit (1), the system for holding and storing (3) comprising a first retaining mechanism (9) comprising a bracket (11) designed to be fixed on a rear wall (13) of the tractor unit (1) and at least one spring (15) having a first extremity (17) attached to the bracket (11) and a second extremity (19) on which at least one of the lines (5) can be hung; and a second retaining mechanism (36) for receiving and holding the couplings (7) arranged at the end of the lines (5); the system for holding and storing (3) further including a magnetic stabilizer (23) configured for attracting and maintaining the spring (15) in a rest position when the tractor unit (1) is moving without trailer (4).