the invention relates to a rod comprising a long plastic body , an axial housing close to the front end corresponding to the push button , and a compression spring mounted in said housing , one end of the spring butting up to the front end wall of the housing , and the other end of the spring butting up to a side piece provided for this purpose on a plastic guiding part on which the rod slides during its straight movement , the guiding part being fixed onto the actuating lever itself . the connection of each part to the traction lever enables the actuation of the handbrake of a motor vehicle .